People with the flu usually have a fever for two to five days. This is different than fever caused by other upper respiratory viruses, which usually resolve after 24 to 48 hours.
Most people with the flu have fever and muscle aches, and some people also have cold-like symptoms (runny nose, sore throat). Flu symptoms usually improve over two to five days, although the illness may last for a week or more. Weakness and fatigue may persist for several weeks
Flu complications — Complications of influenza occur in some people; pneumonia is the most common complication. Pneumonia is a serious infection of the lungs and is more likely to occur in young children, people over the age of 65, people who live in long-term care facilities (nursing homes), and those with other illnesses such as diabetes or conditions affecting the heart or lungs. Pneumonia is also more common in people with weakened immune systems, such as those who have had a transplant. (See "Patient information: Pneumonia in adults
People with the flu usually have a fever for two to five days. This is different than fever caused by other upper respiratory viruses, which usually resolve after 24 to 48 hours.Most people with the flu have fever and muscle aches, and some people also have cold-like symptoms (runny nose, sore throat). Flu symptoms usually improve over two to five days, although the illness may last for a week or more. Weakness and fatigue may persist for several weeks Flu complications — Complications of influenza occur in some people; pneumonia is the most common complication. Pneumonia is a serious infection of the lungs and is more likely to occur in young children, people over the age of 65, people who live in long-term care facilities (nursing homes), and those with other illnesses such as diabetes or conditions affecting the heart or lungs. Pneumonia is also more common in people with weakened immune systems, such as those who have had a transplant. (See "Patient information: Pneumonia in adults
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