Typically, a low-grade fever falls within the range of 98.6°F (37°C) to 100.4°F (38°C), indicating various underlying health conditions that range from minor infections to more severe illnesses. Being able to recognize when a low-grade fever warrants concern is crucial for effective healthcare management.

Explore the following comprehensive guide to understand the symptoms and determine when to seek medical attention.

Some common causes of low-grade fever include viral infections, bacterial infections, inflammatory conditions, autoimmune disorders, medication side effects, and underlying medical conditions such as cancer or HIV/AIDS. It’s important to monitor your symptoms closely and seek medical advice if your fever persists for more than a few days or is accompanied by other concerning symptoms.

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Characterized by a slight elevation in body temperature below the normal fever range, a low-grade fever hovers between 98.7°F (37.1°C) and 100.4°F (38°C).

Low-grade fevers are commonly associated with viral infections, such as the common cold or flu. They can also be caused by other factors, such as dehydration, stress, or certain medications. In most cases, low-grade fevers are not a cause for concern and can be managed with rest and hydration. However, if a low-grade fever persists for more than a few days or is accompanied by other symptoms, it is important to seek medical advice.

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• Common Cold: Viral infections like the common cold or flu can trigger a low-grade fever.
• Mild Bacterial Infections: Conditions such as UTIs or sinusitis may lead to a low-grade fever.
• Chronic Infections: Diseases like tuberculosis or endocarditis could manifest with a persistent low-grade fever.
• Inflammatory Conditions: Certain inflammatory conditions can be a factor in low-grade fevers.
• Autoimmune Disorders: Diseases such as rheumatoid arthritis or lupus may cause ongoing inflammation resulting in a low-grade fever.
• Inflammatory Bowel Disease: Conditions like Crohn’s disease or ulcerative colitis may also contribute to low-grade fevers.

Consult with reputable experts for a second opinion to make informed decisions.

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Low-grade fevers may be accompanied by symptoms like:

• Mild headache
• Fatigue
• Muscle aches
• Chills
• Sweating
• Decreased appetite
• Slightly increased heart rate
• Feeling generally unwell
• These symptoms are often the body’s natural response to fighting off infections or illnesses. It is important to rest, stay hydrated, and consult a healthcare professional if the symptoms persist or worsen.

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Situations where a low-grade fever requires more attention include:

• Duration: If the fever persists for over a week without an obvious cause, seeking medical evaluation is advised.
• Severity of Symptoms: Look out for severe symptoms such as:

• Difficulty breathing
• Chest pain
• Severe headache
• Stiff neck
• Rash
• Persistent vomiting or diarrhea
• Unusual fatigue or weakness

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Diagnosing a low-grade fever involves a comprehensive assessment by a healthcare provider:

• Medical History: Reviewing symptoms, recent illnesses, medications, and exposure to infections.
• Physical Exam: Checking for signs of underlying conditions.
• Temperature Measurement: Confirming fever using a thermometer.
• Laboratory Tests: Ordering blood, urine tests, or cultures for investigation.
• Imaging: Conducting necessary imaging tests like X-rays or ultrasounds.

If the cause remains unclear, further testing may be necessary.

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Managing a low-grade fever involves symptom management:

• Rest and Hydration: Ensure adequate rest and fluid intake to stay hydrated.
• Over-the-Counter Medications: Consider using acetaminophen or ibuprofen to reduce fever.
• Cool Compresses: Applying a cooling cloth can help lower body temperature.
• Light Clothing: Opt for light clothing to prevent trapping heat.
• Monitor the Fever: Keep track of symptom changes and progress.

If the fever persists or worsens, seek medical advice promptly.

Additional tips for managing a low-grade fever:

• Stay Indoors: Avoid exposure to extreme temperatures.
• Stay Hydrated: Drink plenty of water and clear fluids.
• Use a Fan: Using a fan or air conditioning can help cool you down.
• Take a Lukewarm Bath: A lukewarm bath or shower can help reduce fever.
• Get Plenty of Rest: Allow your body time to recover by getting ample rest.

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By avoiding triggering infections, some low-grade fevers can be prevented. Vaccinations offer protection against fevers, as most fevers are the body’s response to illnesses.

Your health should always be a priority – take proactive steps to care for it today.

It is important to maintain good hygiene practices, such as washing hands regularly and avoiding close contact with sick individuals, to reduce the risk of infections that can lead to fevers.

In addition to vaccinations, getting enough rest, staying hydrated, and eating a balanced diet rich in fruits and vegetables can also help support your immune system and reduce the likelihood of developing a fever.

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If experiencing persistent low-grade fever or alarming symptoms, it is essential to reach out to a healthcare provider for accurate diagnosis and appropriate treatment.

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Human body temperature typically remains fairly consistent, but deviations can occur, resulting in a fever.

A normal body temperature falls within the range of 97 to 99 degrees Fahrenheit; exceeding 100.4 degrees may indicate the presence of a fever.

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Normal body temperature is usually between 97.7 and 99.5 degrees.

While 99 degrees is often not classified as a fever, when accompanied by symptoms, it may indicate an underlying illness.

Fevers are generally recognized by body temperatures above 100.4 degrees Fahrenheit.

It’s important to note that body temperature can vary throughout the day and can be influenced by factors such as physical activity, food consumption, and hormonal changes.

If you suspect you have a fever, it’s recommended to rest, stay hydrated, and monitor your temperature. If your fever persists or is accompanied by severe symptoms, seek medical attention.

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A fever is the body’s way of fighting an infection. It is usually caused by bacterial infections such as strep throat, viral infections like the flu, or even allergies.
The body raises its temperature in response to these infections to help kill off the invading pathogens.

If you or someone you know has a fever, it is important to seek medical advice. Fevers can be a sign of a more serious underlying condition and should not be ignored.
In some cases, medical treatment may be necessary to help the body fight off the infection causing the fever.

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An often overlooked category, a low-grade fever typically hovers between 100.4 and 102.2 degrees, where temperatures above 101 degrees are still classified within this range.

In adults, low-grade fevers usually do not require immediate treatment unless accompanied by concerning symptoms.

To naturally reduce fever, maintain minimal clothing, take lukewarm baths, and ensure adequate hydration.

Even mild fevers can indicate contagious illnesses, emphasizing the importance of practicing good hygiene.

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Temperatures above 102.2 degrees could indicate a severe infection.

While most fevers resolve within days, persistent or severe cases necessitate medical attention.

Consult a healthcare provider if the fever lasts beyond three to five days or is accompanied by specific symptoms.

In emergency situations like seizures or severe pain, immediate medical assistance should be sought.

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Fevers from viral infections typically resolve on their own. Manage symptoms accordingly if the fever becomes uncomfortable.

Even with a mild fever, prioritize rest, isolation, and adherence to recommended medications.

• Take a lukewarm bath or shower

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About the author Katie Faley

Katie Faley serves as a Writing Coordinator for OSF HealthCare, having graduated with a degree in English Studies from Illinois State University. With a background in magazine editing, digital marketing, and freelance writing, she joined OSF HealthCare in 2021. In her free time, Katie enjoys listening to ‘60s folk music, exploring new skills, losing track of time in libraries, and spending quality time with family and friends.

This article was reviewed by Jason R. McKnight, MD, MS, a family medicine physician and clinical assistant professor at Texas A&M College of Medicine.

Your body develops a fever to combat disease cells and impede their survival. Image by Boris Zhitkov/Getty Images

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• A low-grade fever occurs when the body temperature is elevated but remains below 100.4°F.
• Causes of a low-grade fever may include the common cold, flu, stomach virus, or UTI.
• A low-grade fever alone is generally not cause for concern as a slight rise in temperature does not harm the body.

Various illnesses can induce a fever, where the body temperature rises above 100.4°F. Sometimes, the body temperature may increase, but not reach the threshold for a fever, often termed as a “low-grade fever” despite not meeting the fever definition.

Typically, low-grade fevers do not warrant immediate concern, as common ailments such as ear infections or stomach bugs may cause them. However, in rare instances, more serious infections can also be accompanied by a low-grade fever.

Gain valuable insights into how to manage low-grade fevers and understand when medical attention is necessary.

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A low-grade fever is characterized by body temperature falling between normal levels and 100.4°F, as stated by Troy Madsen, MD, an emergency medicine professor at the University of Utah.

There is a discrepancy within the medical field regarding the exact body temperature categorization for a fever. Madsen explains that the definition may vary between 100.4 and 100.5, depending on the healthcare provider and institution.

While there is ongoing debate about the existence of a low-grade fever, some healthcare providers acknowledge any temperature between normal and 100.4°F as a low-grade fever, while others require a temperature above 100.4°F to designate a fever.

Body temperature may fluctuate based on factors like age or time of day, with the average falling between 97 and 99°F for most individuals.

During illness, the body’s temperature increases as a means to thwart the survival of disease cells, potentially signaling the onset of an infection when experiencing a low-grade fever.

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“Infections causing a typical fever can also provoke a low-grade fever, especially in the early infection stages,” notes Madsen.

Aside from infections, other factors contributing to low-grade fevers include:

• Vigorous exercise
• Being in hot weather or heavy clothing
• Autoimmune disorders like rheumatoid arthritis
• Recent flu vaccination
• Increased stress levels

For severe infections like meningitis, low-grade fevers are transient, quickly transitioning to temperatures above 100.5°F within a day, highlighting the seriousness of the infection.

In certain situations, an increase in body temperature is a typical response and is usually not a cause for worry, according to Madsen. Along with a mild fever, you may experience sweating, slight chills, a headache, or a flushed face. However, if your mild fever is accompanied by symptoms like extreme fatigue or confusion, then it may be a cause for concern, Madsen explains.
A mild fever in itself is not necessarily a reason for alarm, Madsen states, as a slightly elevated temperature will not harm your body. Nevertheless, mild fevers can bring along some uncomfortable symptoms that may require treatment. For instance, you may be in the early stages of a cold or the flu, characterized by a mild fever, body aches, and a sore throat. Taking a non-steroidal anti-inflammatory drug like ibuprofen can help alleviate these symptoms and reduce your temperature. However, it is not essential to take medications unless your fever exceeds 102°F. If your mild fever is due to overheating, wearing loose clothing, resting in a cool area, or taking a cold shower can aid in bringing your body temperature back to normal.
Regardless of the cause of your fever, staying hydrated is crucial. A mild fever typically does not lead to severe dehydration, but your body loses fluids more rapidly when your temperature is elevated. Drinking cold fluids can aid in lowering your body temperature. It is also important to continue monitoring your temperature to determine if it rises above 100.5 degrees and becomes a significant fever. You can check your temperature orally, rectally, or under your armpit using a thermometer.
“A mild fever in itself does not necessarily warrant a visit to the doctor,” Madsen points out, “but if you are experiencing other symptoms along with an elevated body temperature, it may be a good idea to contact your doctor.”
Look out for signs of an infection, as a bacterial infection may require antibiotic treatment. Some symptoms to watch for include burning during urination, difficulty breathing, a persistent cough, congestion that doesn’t improve after a week, a rash, and a severe headache. For most adults and children, contacting your doctor is advisable if your temperature surpasses 103°F. For infants under 3 months old, it is recommended to call the doctor if their temperature exceeds 100.4°F.
In rare instances, individuals may have mild fevers for weeks or months, as noted by Madsen. This symptom should not be ignored, as it could indicate a condition like lymphoma. “If your body temperature seems consistently high over an extended period, it is wise to consult your doctor, especially if you are experiencing unexplained weight loss or extreme fatigue,” Madsen advises.
A mild fever is defined as a body temperature between 99 and 100.5°F. In most cases, a mild fever is not a cause for concern, and you can find relief from symptoms by taking ibuprofen or consuming cold water. However, if your fever continues to rise or if you develop unusual symptoms, it is recommended to contact your doctor to rule out any infections or serious medical conditions.

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Youngsters Normal temperature range: 35.5°C-37.8°C Average temperature range: 36.6°C-37.9°C Optimal temperature range: 36.5-37.2°C Individuals of Mature Age Normal body temperature ranges from 35.6–36.7°C The average temperature is usually between 36.1–37.2°C Slight variations can be seen in the range of 35–36.1°C Elderly individuals Normal temperature range: 33.9–37°C Mild fever: 34.4–37.6°C Low-grade fever: 33.3–36.4°C

Understanding Low-Grade Fever

Low-grade fever occurs when the body temperature is slightly higher than normal, typically ranging between 37.3°C – 37.9°C. This can signal the activation of the immune system.

When to Seek Help for Children

Continuous low-grade fever in children, though usually not serious, may require monitoring or medical evaluation.

• For infants under 3 months: Any slight temperature increase should be checked to rule out serious infections.
• Children: If low-grade fever lasts more than 3 days, especially with other symptoms or daily occurrence in the afternoons, a doctor’s visit is advised.

What Continuous Low-Grade Fever in Adults Could Mean

Prolonged or daily recurring low-grade fever in adults is a potential indication of an underlying issue in the body.

• If lasting 1-3 days with no other symptoms, it is usually not concerning.
• If persisting more than 3 days, it could signify an infection like the common cold or the flu, warranting a doctor’s visit.

Possible Causes of Low-Grade Fever

While viral infections are common culprits, there are various other reasons for experiencing a low-grade fever over several days. Some other possible causes include:

• Bacterial infections
• Autoimmune disorders
• Inflammatory conditions
• Thyroid disorders
• Medication side effects
• Allergic reactions
• Heat exhaustion
• Dehydration
• Certain cancers

It is important to consult with a healthcare provider to determine the underlying cause of a persistent low-grade fever and to receive appropriate treatment.

When to Contact a Doctor

1. Prolonged fever without improvement
2. Accompanying unusual rashes
3. Painful urination
4. Breathlessness
5. Chest pain
6. Severe headaches
7. Neck swelling
8. Seizures

If any of these symptoms occur, prompt medical attention is advisable.

Managing Low-Grade Fever

Typically, low-grade fever resolves on its own without medication, but these steps may help if it persists:

1. Stay hydrated
2. Rest adequately
3. Take lukewarm baths
4. Dress lightly to prevent a temperature rise
5. Consider antipyretics following professional advice, and immune-boosting supplements such as:

• Vitamin D
• Zinc
• Vitamin C
• Echinacea
• Propolis
• Astragalus

Don’t Ignore Low-Grade Fever

Even if it seems mild, persistent low-grade fever or accompanying symptoms should not be overlooked. Monitor closely and seek medical guidance if needed.

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