Fever (unknown origin)
The cause of this fever is unknown. In some people the cause may never be known. Finding a cause may be delayed if there is:
- A common illness that does not have the usual symptoms
- An infection that is often hard to diagnose
- Illness with symptoms that only appear later
- Illness that may not show up on tests until later, called delayed positive test
- Genetic condition that causes fever (rare)
The fever may be steady or come and go. Chills, sweating, and other symptoms may also be present. They can vary based on the cause.
You will be asked about your symptoms and past health. A physical exam will be done. Your doctor may ask questions to look for possible causes. Questions may include:
- Have you traveled?
- Have you been hospitalized?
- Is your immune system damaged?
- What medicine are you taking?
- Have you been near anyone who has been ill?
- Have you ever been around someone with tuberculosis?
Tests to look for cause may include:
- Blood and urine tests
- CT scan
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.
Edits to original content made by Denver Health.
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