What Can Cause a Fever With No Other Symptoms?

Having a fever without any other obvious symptoms can be confusing. You may take your temperature and see 100.4°F, 101°F, 102°F, or even higher, yet have no cough, sore throat, congestion, stomach pain, or other clear sign of illness.

So, what can cause a fever with no other symptoms?

The most common explanation is an infection that is just beginning. A fever can sometimes appear before other symptoms become noticeable. Other possibilities include a bacterial infection with no obvious localized symptoms, a medication reaction, a recent vaccination, inflammatory conditions, or a heat-related rise in body temperature.

For adults, the temperature itself is only one part of the picture. How long the fever lasts, whether it keeps returning, how high it gets, your medical history, recent travel or exposures, and whether new symptoms develop can all affect what the fever means.

A fever of 103°F (39.4°C) or higher in an adult warrants contacting a healthcare professional.

If you have a persistent or unexplained fever in Las Vegas, visiting the best urgent care las vegas allows clinical professionals to evaluate your symptoms and determine whether testing or additional medical care may be appropriate.

What Can Cause a Fever With No Other Symptoms?

A fever without other noticeable symptoms can have several causes. Common possibilities include:

• An early viral infection
• A bacterial infection
• A urinary tract or other infection with subtle symptoms
• A respiratory infection before other symptoms appear
• A medication reaction
• A recent vaccination
• Heat-related illness or overheating
• Inflammatory or autoimmune conditions
• Less common persistent infections or other medical conditions

A short, mild fever in an otherwise healthy adult may resolve on its own. However, a high, persistent, recurrent, or worsening fever should be evaluated by a healthcare professional.

If the fever occurs with difficulty breathing, chest pain, severe confusion, seizures, loss of consciousness, or another emergency symptom, seek emergency medical attention.

Can You Have a Fever With No Other Symptoms?

Yes. It is possible to have a fever without other noticeable symptoms.

Fever is a response of the body rather than a disease itself. In many cases, it happens because the immune system is responding to an infection or another inflammatory trigger.

Sometimes the fever is the first noticeable sign.

For example, you may have a fever today and develop a sore throat, cough, congestion, headache, body aches, nausea, or diarrhea later. In other situations, the fever may remain the only noticeable symptom and resolve as the underlying problem improves.

This is why a fever that appears suddenly does not always reveal its cause immediately.

However, “no other symptoms” does not necessarily mean “no underlying cause.” If the fever is high, persistent, recurrent, or accompanied by warning signs, medical evaluation may be appropriate.

What Is Considered a Fever in Adults?

A commonly used definition of fever in adults is a body temperature of approximately 100.4°F (38°C) or higher, although temperature can vary naturally throughout the day and readings can differ depending on the measurement method.

Your temperature may be measured orally, in the ear, on the forehead, or another way. These methods do not always produce identical readings.

When tracking a fever, record:

• Your highest temperature
• The time you measured it
• How you measured it
• Whether you had recently exercised
• Whether you had been exposed to extreme heat
• Whether you took a fever-reducing medicine
• Whether the temperature is increasing, decreasing, or staying about the same

The pattern is often more useful than a single number.

Is 99°F a Fever?

Usually, no.

Body temperature naturally changes throughout the day, and a reading around 99°F may fall within normal variation for some people.

Is 100°F a Fever?

A temperature of 100°F is elevated but is below the commonly used 100.4°F threshold for fever.

Consider the reading together with how you feel, how long it has lasted, and whether other symptoms appear.

Is 101°F a Fever?

Yes. A temperature of 101°F is generally considered a fever in an adult.

A mild fever may occur with an early infection or another temporary cause, but persistent or worsening fever should be monitored.

Is 102°F a High Fever?

A temperature of 102°F is a significant fever, but the number alone does not determine how serious the underlying illness is.

Consider the duration, symptoms, medical history, hydration status, and whether the temperature is improving.

Is 103°F a Dangerous Fever?

A temperature of 103°F (39.4°C) or higher in an adult warrants contacting a healthcare professional.

The need for emergency care depends on the overall situation. A 103°F fever accompanied by confusion, difficulty breathing, seizures, severe headache, stiff neck, chest pain, or another serious symptom requires more urgent attention.

Why Do I Have a Fever but No Other Symptoms?

There isn’t one answer that applies to everyone.

A fever with no other symptoms can have several possible causes, including:

1. An early viral infection
2. A bacterial infection that has not produced obvious localized symptoms
3. A urinary tract or other hidden infection
4. A medication reaction
5. A recent vaccination
6. Heat-related illness or overheating
7. Inflammatory or autoimmune disease
8. Less common persistent infections or other medical conditions

The likelihood of each cause depends on your age, health history, exposures, medications, travel, recent procedures, and the pattern of your fever.

Common Causes of Fever With No Other Symptoms

1. An Early Viral Infection

An early viral infection is one of the most common possibilities when a person develops a fever without obvious symptoms.

Your immune system may respond to a virus before you develop recognizable respiratory or digestive symptoms.

Depending on the infection, symptoms may appear later and can include:

• Cough
• Sore throat
• Runny or stuffy nose
• Headache
• Fatigue
• Chills
• Muscle aches
• Nausea
• Vomiting
• Diarrhea

Influenza and other respiratory viruses can cause fever, and some people may initially have few symptoms.

A fever may therefore be the first sign that your body is fighting an infection.

2. A Bacterial Infection With Few Obvious Symptoms

Bacterial infections can also cause fever without immediately producing noticeable symptoms in one particular part of the body.

Possible sources include:

• Urinary tract infections
• Kidney infections
• Pneumonia
• Dental infections
• Skin infections
• Soft-tissue infections
• Abscesses
• Other localized infections

Some infections can produce a systemic response before localized symptoms become obvious.

This does not mean every unexplained fever is caused by a hidden bacterial infection. It means that the source may not always be obvious from symptoms alone.

3. Urinary Tract Infection or Kidney Infection

A urinary tract infection is another possible explanation for an unexplained fever.

Typical urinary symptoms can include:

• Burning or pain during urination
• Frequent urination
• An urgent need to urinate
• Lower abdominal discomfort
• Cloudy or unusual-smelling urine

However, symptoms can vary from person to person.

A kidney infection can be more serious and may cause:

• Fever
• Chills
• Back or side pain
• Nausea or vomiting
• Feeling generally unwell

If fever is accompanied by significant back or side pain, vomiting, or worsening illness, seek medical evaluation.

A urine test may be considered when a urinary source is suspected.

4. A Respiratory Infection Before Respiratory Symptoms Appear

You don’t necessarily need to have a cough or congestion for a respiratory infection to be developing.

A fever may appear before symptoms such as:

• Sore throat
• Cough
• Nasal congestion
• Runny nose
• Body aches
• Fatigue

If you have recently been exposed to someone with a respiratory infection, tell your healthcare provider.

Depending on the situation, testing for respiratory viruses may be appropriate.

5. Medication-Related Fever

Some medications can cause fever as an adverse reaction. This is sometimes called drug fever.

It may occur after starting a new medication or changing treatment, although the timing varies depending on the medication and individual.

Potentially associated medications include certain:

• Antibiotics
• Antiseizure medications
• Blood pressure medications
• Other prescription medicines

If your fever started after beginning a new medication, tell your healthcare provider exactly what you are taking and when you started it.

Do not assume that the medication is responsible without medical guidance.

Do not stop a prescribed medication on your own unless a healthcare professional tells you to do so or you are experiencing an emergency.

6. Fever After a Vaccination

A temporary fever can occur after some vaccinations as the immune system responds.

If you recently received a vaccine and subsequently developed a fever, tell your healthcare provider:

• Which vaccine you received
• When you received it
• When the fever started
• Your highest temperature
• Whether other symptoms developed

The timing can help your healthcare provider determine whether the fever may be related to the vaccination or whether another cause should be investigated.

7. Heat Exposure and Overheating

For people living in or visiting Las Vegas, heat exposure deserves special attention.

Spending prolonged time outdoors, exercising in hot conditions, working in the heat, or becoming overheated can cause a dangerous rise in body temperature.

However, there is an important distinction:

A true fever and heat-related hyperthermia are not the same thing.

A fever occurs when the body’s temperature-regulating system raises its internal set point, commonly as part of an immune response.

Hyperthermia occurs when the body gains or produces more heat than it can effectively eliminate.

Heatstroke is a medical emergency. If an extremely high temperature develops after heat exposure and the person becomes confused, faints, has a seizure, or has altered mental status, call 911 immediately.

8. Dehydration

Dehydration can occur during fever, vomiting, diarrhea, intense exercise, or prolonged exposure to hot weather.

Signs of dehydration can include:

• Excessive thirst
• Dry mouth
• Dizziness
• Weakness
• Reduced urination
• Dark-colored urine

Dehydration and fever can occur together, but dehydration-related overheating should not automatically be labeled as a true fever.

If you have been exposed to extreme Las Vegas heat, move to a cooler environment and drink fluids if you can safely do so.

If you develop confusion, fainting, seizures, or a dangerously high body temperature, seek emergency care.

9. Inflammatory or Autoimmune Conditions

Not all fevers are caused by infections.

Inflammatory and autoimmune diseases can activate the immune system and produce fever.

Examples include:

• Rheumatoid arthritis
• Lupus
• Inflammatory bowel disease
• Vasculitis
• Other systemic inflammatory conditions

These conditions are generally more relevant when fever is persistent or recurrent or when other signs of inflammation are present.

A short-lived isolated fever in an otherwise healthy adult is much more commonly associated with an acute illness than with a chronic inflammatory condition.

10. Blood Clots and Other Less Common Causes

Some non-infectious conditions can also be associated with fever.

For example, deep-vein thrombosis and pulmonary embolism can sometimes be associated with elevated temperature.

Possible warning signs of a serious blood clot include:

• Unexplained swelling in one leg
• Leg pain or tenderness
• Sudden shortness of breath
• Chest pain
• Rapid heartbeat
• Fainting

If these symptoms occur, seek emergency medical attention rather than waiting for a routine urgent-care evaluation.

11. Cancer and Persistent Unexplained Fever

Certain cancers, including some blood cancers such as lymphoma and leukemia, can cause fever.

However, this is not the usual explanation for a short-term fever with no other symptoms.

Cancer becomes more relevant when fever is persistent, recurrent, or associated with other unexplained changes such as:

• Unintentional weight loss
• Persistent night sweats
• Enlarged lymph nodes
• Prolonged fatigue
• Unexplained bruising or bleeding

Persistent unexplained fever may require a broader medical evaluation.

Fever With No Other Symptoms in Adults

A fever without other symptoms can be relatively minor, particularly when it is mild, short-lived, and improving.

Adults should pay attention to the pattern of the fever.

Ask yourself:

• How high is the fever?
• When did it begin?
• Is it getting better?
• Does it keep coming back?
• Does medication lower it temporarily?
• Have I recently been around someone who was sick?
• Have I traveled recently?
• Did I recently start a medication?
• Did I recently receive a vaccine?
• Have I recently had surgery or a medical procedure?
• Have I spent significant time in extreme heat?
• Do I have an underlying medical condition?

These details can help a healthcare professional determine which causes deserve consideration.

How Long Can a Fever Last Without Other Symptoms?

There is no universal number of hours that determines whether a fever is dangerous.

Some short-term fevers resolve as the underlying illness improves.

However, an adult should consider contacting a healthcare professional when a fever:

• Lasts longer than 48–72 hours
• Keeps returning
• Continues increasing
• Reaches 103°F (39.4°C) or higher
• Occurs in someone with significant underlying health conditions
• Is accompanied by new or worsening symptoms

The exact timing should still be interpreted in context.

What Is Fever of Unknown Origin?

A short fever with no obvious symptoms should not automatically be called a fever of unknown origin (FUO).

FUO is a medical term used for a much more prolonged and unexplained fever.

Classic FUO is generally characterized by a temperature of at least approximately 101°F (38.3°C) that persists for more than three weeks without an identified cause after appropriate evaluation.

Possible categories of FUO causes include:

• Infections
• Inflammatory or rheumatologic conditions
• Malignancies
• Medication reactions
• Other less common medical conditions

This is very different from having a 101°F fever for one day with no other symptoms.

Can Stress Cause a Fever?

Stress can affect how you feel and may influence body temperature.

However, you should not automatically assume that a measured fever is caused by stress.

If you have a persistent temperature of 100.4°F (38°C) or higher, consider infection and other medical causes, particularly if the fever continues or rises.

Can Anxiety Cause a Fever?

Anxiety can cause sensations such as:

• Feeling hot
• Sweating
• Flushing
• Rapid heartbeat
• Shaking

These sensations can feel similar to having a fever.

If a thermometer shows a persistent elevated temperature, however, don’t assume anxiety is the explanation without considering other causes.

Can Allergies Cause a Fever?

Typical allergies do not usually cause a true fever.

Seasonal allergies commonly cause symptoms such as:

• Sneezing
• Runny nose
• Nasal congestion
• Itchy eyes
• Watery eyes

If you have a measured fever along with symptoms that seem like allergies, an infection or another condition may need to be considered.

Can Exercise Cause a Fever?

Intense physical activity can temporarily raise body temperature because your muscles produce heat.

This is generally a form of heat production or hyperthermia rather than the immune-system response that causes a true fever.

If your temperature remains elevated after you have stopped exercising and cooled down, or if you develop concerning symptoms, medical evaluation may be appropriate.

Can Dehydration Cause a Fever?

Dehydration can contribute to problems with temperature regulation, especially in hot environments.

However, dehydration and true fever are not identical.

If you have a measured fever, don’t automatically assume dehydration is the cause. Consider infection and other possible explanations as well.

What Should You Do If You Have a Fever but Feel Fine?

If you’re an otherwise healthy adult with a mild fever and no warning signs, reasonable steps include:

Measure Your Temperature

Use a reliable thermometer and record the reading.

Stay Hydrated

Drink fluids regularly unless a healthcare professional has told you to restrict fluids.

Rest

Give your body time to recover and avoid strenuous activity.

Avoid Excessive Heat

Stay somewhere comfortable and cool, particularly if you’ve recently been outdoors in Las Vegas heat.

Monitor for New Symptoms

Pay attention to changes such as:

• Cough
• Sore throat
• Congestion
• Headache
• Body aches
• Abdominal pain
• Urinary symptoms
• Rash
• Vomiting
• Diarrhea
• Shortness of breath

Track the Duration

Record when the fever started and whether it is improving, worsening, or returning.

This information can be helpful if you eventually need medical evaluation.

Should You Take Medicine for a Fever?

Not every fever needs medication.

For adults who are uncomfortable, an appropriate over-the-counter fever reducer may help relieve discomfort.

Common fever-reducing medicines include acetaminophen and ibuprofen, but they are not appropriate for everyone.

Follow the product label carefully and avoid taking multiple products containing the same active ingredient.

Talk with a healthcare professional or pharmacist before taking these medicines if you have conditions such as liver disease, kidney disease, stomach ulcers, are pregnant, take blood thinners, or take multiple medications.

The purpose of treating a fever is often to improve comfort rather than simply making the thermometer display a normal number.

When Should You See a Doctor for a Fever With No Other Symptoms?

Consider contacting a healthcare professional when:

• Your temperature reaches 103°F (39.4°C) or higher
• The fever lasts longer than 48–72 hours
• The fever repeatedly returns
• The fever is getting higher
• You have a weakened immune system
• You have significant chronic medical conditions
• You recently traveled internationally
• You recently had surgery or another procedure
• You recently started a new medication
• You have persistent unexplained fatigue or weight loss
• You develop a rash
• You develop urinary symptoms
• You are becoming dehydrated
• You are concerned that your condition is worsening

The right threshold can differ depending on age, health conditions, medications, and the overall clinical picture.

When Is a Fever an Emergency?

A fever itself does not always require emergency care.

However, fever accompanied by certain symptoms can indicate a medical emergency.

Call 911 or go to the nearest emergency department if you experience:

• Difficulty breathing
• Chest pain
• Confusion
• Loss of consciousness
• Seizures
• Severe or sudden headache
• Stiff neck
• Severe weakness
• Persistent vomiting with signs of dehydration
• Severe abdominal pain
• Blue or gray lips or skin
• Rapidly worsening symptoms

Heatstroke Warning

If an extremely high body temperature develops after prolonged heat exposure and the person becomes confused, has altered mental status, faints, or has a seizure, call 911 immediately.

Heatstroke is a medical emergency and should not be managed by waiting for an urgent-care appointment.

Is Urgent Care Appropriate for a Fever With No Other Symptoms?

Urgent care can be appropriate when you have a persistent or concerning fever but do not have symptoms that indicate a life-threatening emergency.

You may consider urgent care in Las Vegas if:

• Your fever has persisted
• You have an unexplained fever
• Your fever keeps returning
• You suspect an infection
• You need an evaluation outside your primary doctor’s availability
• New but non-emergency symptoms have developed
• You are unsure whether you need testing

An urgent-care clinician can review your symptoms, perform an examination, and determine whether testing or additional medical care is appropriate.

An urgent-care visit may also be useful when you need evaluation but your situation does not appear to require an emergency department.

However, urgent care is not a substitute for emergency services.

If you have difficulty breathing, chest pain, severe confusion, seizures, loss of consciousness, or another life-threatening symptom, call 911.

How Is the Cause of an Unexplained Fever Diagnosed?

There isn’t one test that identifies every possible cause of fever.

Instead, evaluation usually begins with your medical history and physical examination.

1. Medical History

Your healthcare provider may ask about:

• When the fever started
• Highest temperature
• How you measured your temperature
• Recent illnesses
• Sick contacts
• Recent travel
• New medications
• Recent vaccinations
• Recent surgery or procedures
• Animal or environmental exposures
• Heat exposure
• Underlying medical conditions

2. Physical Examination

A clinician may look for subtle signs that aren’t obvious to you.

Depending on the situation, this may include examining your:

• Throat
• Ears
• Lungs
• Abdomen
• Skin
• Lymph nodes
• Other areas suggested by your history

3. Laboratory Testing

Testing depends on what the history and examination suggest.

Possible tests may include:

• Urinalysis
• Respiratory testing
• Blood tests
• Other targeted laboratory testing

4. Imaging

Imaging may be considered when the clinical evaluation suggests an internal source that cannot be assessed adequately through examination alone.

For example, a chest X-ray may be appropriate when a respiratory or lung-related problem is suspected.

Not everyone with a fever needs every test.

Good medical evaluation is targeted to the individual rather than automatically ordering every available test.

What Tests Might Be Done for Fever With No Other Symptoms?

Depending on your symptoms and medical history, a healthcare provider may consider:

Possible Test	Why It May Be Considered
Temperature measurement	Confirms and tracks the fever
Urinalysis	Looks for evidence of a urinary source
Respiratory testing	Checks for certain respiratory infections
CBC or other blood tests	May provide information about infection or inflammation
Chest X-ray	May be considered when a lung or chest source is suspected
Additional tests	Selected according to history and examination

The appropriate testing varies from patient to patient.

A healthcare provider may decide that no immediate testing is needed if the fever is mild, short-lived, and the overall assessment is reassuring.

What Information Should You Track Before Your Appointment?

If your fever continues, keeping a simple record can make your medical evaluation more useful.

Write down:

• When the fever started
• Highest temperature
• Time of each temperature reading
• How you measured it
• Fever-reducing medications taken
• Any new medications
• Recent vaccinations
• Recent travel
• Recent illness exposure
• Recent surgery or procedures
• Heat exposure
• New symptoms

This gives your healthcare provider a clearer picture of how the illness is developing.

Fever With No Other Symptoms in Las Vegas

If you live in Las Vegas or are visiting the area, consider both illness-related fever and heat-related temperature elevation.

Las Vegas can experience periods of extreme heat, making heat exposure an important consideration for:

• Outdoor workers
• Athletes
• Hikers
• Tourists
• People exercising outdoors
• People spending extended periods outside

Take steps to reduce heat exposure and recognize the warning signs of heat-related illness.

If your temperature rose after significant heat exposure, think about whether the situation could involve overheating rather than a conventional fever.

If you have confusion, fainting, seizures, altered mental status, or an extremely high body temperature following heat exposure, call 911.

For a persistent or unexplained fever without emergency warning signs, an urgent-care evaluation can help determine what to do next.

FAQs

Can you have a fever with no other symptoms?

Yes. A fever can occur before other symptoms appear or remain the only noticeable symptom of an illness. Infection is a common cause, but medication reactions, inflammatory conditions, and other causes are also possible.

Why do I have a fever but feel fine?

You may be in the early stages of an infection, have a mild illness, or have another cause of elevated temperature. Feeling well does not necessarily identify the cause of the fever.

What causes a fever with no other symptoms in adults?

Common possibilities include early viral infection, bacterial infection, medication reactions, recent vaccination, and other inflammatory or medical conditions. Heat-related hyperthermia should also be considered after significant heat exposure.

What causes a high fever with no other symptoms?

A high fever can occur with an infection even before other symptoms appear. Other possible causes include medication reactions and inflammatory conditions. A temperature of 103°F (39.4°C) or higher in an adult warrants contacting a healthcare professional.

Is 101°F a fever?

Yes. A temperature of 101°F is generally considered a fever in an adult.

Is 102°F a high fever?

A temperature of 102°F is a significant fever, but the number alone does not determine the severity of the underlying illness. Duration, symptoms, medical history, and overall condition matter.

Is 103°F a dangerous fever?

A temperature of 103°F (39.4°C) or higher in an adult warrants contacting a healthcare professional. Emergency care is especially important when the fever occurs with serious symptoms such as confusion, seizures, difficulty breathing, chest pain, or stiff neck.

Can a viral infection cause only a fever?

Yes. A fever may occur before other viral symptoms develop, and some viral infections can produce relatively few symptoms.

Can a UTI cause fever without burning when you pee?

It can. Urinary symptoms are not identical in every person, so an unexplained fever may lead a clinician to consider a urinary source depending on the rest of the clinical picture.

Can dehydration cause a fever?

Dehydration and fever can occur together, and dehydration can interfere with temperature regulation during heat exposure. However, true fever and heat-related hyperthermia are different processes.

Can allergies cause a fever?

Typical allergies do not usually cause a true fever. A measured fever may suggest an infection or another cause rather than allergies alone.

Can stress cause a fever?

Stress can affect body temperature and create sensations of warmth or flushing, but persistent measured fever should not automatically be attributed to stress.

Can exercise cause a fever?

Intense exercise can temporarily increase body temperature because the body produces more heat. This is different from the regulated temperature increase associated with a true fever.

How long can a fever last without other symptoms?

A short fever may resolve as an underlying illness improves. Adults should contact a healthcare professional when a fever lasts longer than 48–72 hours, repeatedly returns, or becomes high.

Should I go to urgent care for a fever with no other symptoms?

Urgent care may be appropriate for a persistent, unexplained, or concerning fever when you do not have emergency warning signs. If you have difficulty breathing, chest pain, confusion, seizures, loss of consciousness, or another emergency symptom, call 911.

What tests are used to find the cause of a fever?

Depending on the situation, evaluation may include a physical examination, respiratory testing, urine testing, blood tests, or imaging such as a chest X-ray. Testing is selected based on your medical history and examination rather than automatically performing every test.

Fever Without Other Symptoms

A fever without other symptoms can happen for many reasons, and the most common explanation may be an infection that is still developing.

However, the temperature alone cannot tell you what’s causing it.

Pay attention to:

• How high your temperature is
• How long the fever lasts
• Whether it keeps returning
• Whether new symptoms develop
• Recent medications or vaccinations
• Recent travel or illness exposure
• Heat exposure
• Your underlying health conditions

A mild, short-lived fever in an otherwise healthy adult may resolve without specific treatment.

But a fever that is high, persistent, recurrent, worsening, or accompanied by concerning symptoms should be evaluated by a healthcare professional.

If a fever occurs with symptoms of a medical emergency—such as difficulty breathing, chest pain, severe confusion, seizures, loss of consciousness, or severe dehydration—seek emergency care immediately.

Need Fever Evaluation in Las Vegas?

If you have a persistent or unexplained fever and don’t know whether you should wait it out, Sahara West Urgent Care & Wellness can evaluate your symptoms and help determine the appropriate next step.

Our team can assess your medical history and symptoms, perform a physical examination, and determine whether diagnostic testing or additional medical care may be appropriate.

You can also review our available medical services to learn more about the types of care offered at the clinic.

Walk-ins are welcome.

Sahara West Urgent Care & Wellness

Address:
6125 West Sahara Avenue
Las Vegas, NV 89146

Hours:
Monday–Friday: 9:00 AM–8:00 PM
Saturday: 9:00 AM–3:00 PM

Phone: (702) 248-0554

Ready to get evaluated? Schedule your evaluation or call the clinic if you have questions about whether urgent care is appropriate.

If you are experiencing a medical emergency, call 911 or go to the nearest emergency department.

Important Medical Disclaimer

This article is intended for general educational purposes and does not diagnose or treat any individual condition. Fever can have many causes, and the appropriate evaluation depends on your symptoms, temperature, medical history, age, medications, and other circumstances. If you are concerned about a fever or your condition is worsening, contact a qualified healthcare professional. If you believe you are experiencing a medical emergency, call 911.