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A fever really does not last more than 2-3 days, unless there is a major underlying cause. It is important to take the individual to the doctor if the fever is extremely high or lasting more than the normal amount of time.
How long will the influenza last? Usually, influenza lasts three to five days. If it goes on for more than a week or if the symptoms are very severe, you are advised to consult your doctor. A bad case of influenza has the potential to develop into a more serious condition like pneumonia or sinus trouble, and in rare cases it can be life-threatening.