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How long should a fever typically last?

I've had flu symptoms and a fever for about a week now and I'm a little nervous. Are you supposed to have a fever the entire time you are sick or should it only last a few days? Could something be wrong if my fever won't go away?
Yes, something definitely could be wrong if you think you have a fever and it has been persistent for over a week. Definitely a fever may last for different durations depending on the clinical situation, and may not resolve itself if the cause is serious. A fever is generally a manifestation of systemic inflammation. If there is persistent inflammation for a variety of possible reasons, you may continue to have a fever. There is no fixed time for how long a fever should last. It also depends as to what your symptoms are and what you define as a fever. A fever of 100.4 is generally what is considered significant, and depending on your symptoms maybe due to a virus, a bacterial infection, drug related. It is of the utmost importance that you make an appointment to see your primary care physician to discuss your situation. Your doctor will be able to ask you questions about your clinical picture in depth, perform a detailed physical exam, order necessary lab tests to check for inflammatory changes and for other alarming values. Depending on these results, your doctor will be able to treat you appropriately, possibly with antibiotics or with other therapy.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.