What could be causing recurrent fevers in adults at night?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Recurring fevers at night in adults may be caused by many different things like cancers, infections and autoimmune diseases.

Important Next Steps

Discover causes of recurrent night fevers See if your night fevers need care Find out what’s causing nighttime fevers Explore OTC options for fever relief Find a doctor for fever evaluation Learn medically backed remedies for night fevers Understand if recurring fevers need urgent care

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Explanation

Fever is defined as a body temperature greater than 38 degrees Celsius (100.4 degrees Farenheit). Your body temperature can fluctuate by about 0.5 to 1.0 degrees Celsius throughout the day. It is often the highest during the day and evening.

There are a whole host of possible causes for recurring fevers at night. Some of them include infectious diseases, cancer, autoimmune diseases, and psychogenic fever. As a result, it is important to consult your primary care provider.

If you don't have a primary care provider, you can start by using a free symptom checker to help identify what might be causing your symptoms and determine the best next steps for care.

(References)

Unger M, Karanikas G, Kerschbaumer A, Winkler S, Aletaha D. Fever of unknown origin (FUO) revised. Wien Klin Wochenschr. 2016 Nov;128(21-22):796-801. doi: 10.1007/s00508-016-1083-9. Epub 2016 Sep 26. PMID: 27670857; PMCID: PMC5104815.

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