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A low-grade fever is a body temperature that is slightly above normal (usually between 37.5°C and 38.3°C or 99.5°F to 100.9°F) and lasts for more than a few days without reaching a high fever. It is the body's way of fighting an infection or responding to other health issues.
Key facts
Yes, low-grade fevers are very common. Many people experience them during a cold, flu, or other mild illness. A low-grade fever that lingers for more than a week is less common but still happens often enough to be a frequent reason for visiting a doctor.
Anyone can have a lingering low-grade fever, but it is more common in people with weakened immune systems, chronic health conditions, young children, and older adults. It can also affect people recovering from infections or surgery.
Your doctor will ask about your symptoms, medical history, and any recent travel or exposures. They will take your temperature and do a physical examination.
Treatment focuses on the cause of the fever, not just the fever itself. For most viral infections, supportive care is enough. If a bacterial infection is found, antibiotics may be prescribed. For inflammatory or autoimmune conditions, anti-inflammatory treatments can help. Always follow your doctor’s advice on managing the underlying problem.
Having a lingering low-grade fever can be tiring and frustrating. Listen to your body – rest when you need to, and don't push yourself to return to normal activities too quickly. Keep a simple diary of your temperature and any other symptoms to share with your doctor. Most low-grade fevers resolve without long-term effects.
Not all fevers can be prevented, but you can reduce your risk of infections that cause fevers by washing your hands regularly, avoiding close contact with sick people, and keeping your immune system healthy with good nutrition and sleep.
Staying up to date with recommended vaccines – such as the flu vaccine, COVID-19 vaccines, and other adult vaccines – can prevent some infections that cause fevers. Ask your doctor or pharmacist which vaccines are right for you.
Routine health check-ups can help find conditions like chronic infections or autoimmune diseases early, which may prevent a fever from going unnoticed for too long. If you have a family history of certain illnesses, talk to your doctor about screening.
For most people, a low-grade fever that lingers is not a sign of something dangerous and will eventually go away. With proper medical advice, the cause can often be found and treated. Even if the cause is not immediately clear, your doctor can monitor you and help manage your symptoms. The outlook is generally very good, especially when you work with your healthcare team.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 9, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.
The doctor will try to find the underlying cause. They may start with simple tests and then do more targeted ones if needed. You may need to return for follow-up if the fever continues. Do not worry if initial tests are normal – sometimes the cause is a mild virus that takes time to clear. Your doctor will work with you step by step.
If an infection is diagnosed, your doctor may recommend prescription medication such as antibiotics or antivirals. For inflammatory conditions, they might suggest anti-inflammatory medicines or other treatments to calm the immune system. Never take any medication without talking to your doctor first, especially if you have other health conditions or take other medicines.
Surgery is rarely needed for a low-grade fever itself. It may be required if the fever is caused by an abscess or infection that needs draining, but this is uncommon.
Eat a balanced diet with plenty of fruits, vegetables, and whole grains to support your immune system. Stay hydrated. Light exercise like stretching or walking is fine if you feel up to it, but avoid intense workouts until the fever has fully gone and you have energy again.
A fever that won't go away can make you feel anxious, worried, or down. It is normal to feel frustrated when you don't know the cause. Talk to your doctor about your worries. If you feel overwhelmed, reach out to a mental health professional or crisis helpline – your emotional health is just as important as your physical health.