Cold and Flu

What are the symptoms of the flu?

A Answers (12)

  • AStacy Wiegman, PharmD, Pharmacy, answered
    Influenza, better known as the flu, can cause the following symptoms:
    • fever
    • fatigue
    • headaches and body aches
    • cough
    • sore throat
    • runny nose
    • stuffed-up nose
    Vomiting and diarrhea are possible symptoms of the flu, too, though they're more common in children. The symptoms of the flu can come on very quickly.

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  • The symptoms of influenza (flu) include a high fever, often over 103 for children; cough; chills; and muscle aches. People with influenza may also experience fatigue, low appetite, headaches, and nasal symptoms such as a runny nose or congestion. In children, influenza can produce digestive problems such as nausea, vomiting, and diarrhea.

  • AHealthyWomen answered
    Symptoms of the flu include muscle and joint pain, high fever, a deep cough, chills, fatigue and weakness. These symptoms usually send you straight to bed for three to five days or longer. Afterward, cough and tiredness may persist for days or even weeks. Other symptoms include headache, eye pain and sometimes a stuffy nose and sore throat. Some strains of the flu also produce vomiting and diarrhea. Symptoms usually come on suddenly once you've been exposed to the virus.
  • Influenza ("the flu" for short) is a common respiratory infection caused by a virus. Flu symptoms include:
    • Fever and/or chills
    • Cough
    • Sore throat
    • Runny or stuffy nose
    • Body aches and/or headache
    • Fatigue
    • Diarrhea and vomiting
  • AJoel Fuhrman, MD, Family Medicine, answered
    Symptoms of the flu include:
    • High fever
    • Headache
    • Extreme fatigue
    • Muscle aches
    • Cough, sore throat, and nasal congestion are also common.
    • Gastrointestinal symptoms, such as nausea, vomiting, and diarrhea, are more common in children.
    • Severe headaches and muscle aches usually differentiate the flu from other viral illnesses and colds.
  • Adults: Mild cases of the flu present with symptoms very similar to the common cold (sneezing, nasal drainage, stuffy nose, sore throat, and low fever). Symptoms usually appear suddenly and may include fevers of 101 degrees Fahrenheit (°F) or above, cough, muscle aches and pains, headache, sore throat, chills and sweats, loss of appetite, fatigue (tiredness), and malaise (general bad feeling). The fever and body aches can last three to five days, and the cough and lack of energy may last for two weeks or more.

    Most adults recover from the flu within one or two weeks, but others, especially the elderly and those with compromised immune systems (such as HIV/AIDS or cancer patients), may feel weak and debilitated for several weeks after the infection has gone.

    Children: Flu symptoms in school-age children and adolescents are similar to those in adults. However, children may experience vomiting and diarrhea with the flu, which are rare in adults. Influenza infection in preschool children and infants is difficult to diagnose since its symptoms are so similar to infections caused by other viruses.

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  • AHealthwise answered

    The symptoms of influenza (flu) appear suddenly and often include:

    • Fever of 100°F (37.8°C) to 104°F (40°C), which can reach 106°F (41°C) when symptoms first develop. Fever is usually continuous, but it may come and go. Fever may be lower in older adults than in children and younger adults. When fever is high, other symptoms usually are more severe.
    • Body aches and muscle pain (often severe), commonly in the back, arms or legs.
    • Headache.
    • Pain when you move your eyes.
    • Fatigue, a general feeling of sickness (malaise), and loss of appetite.
    • A dry cough, runny nose and dry or sore throat. You may not notice these during the first few days of the illness when other symptoms are more severe. As your fever goes away, these symptoms may become more evident.

    Influenza usually does not cause symptoms in the stomach or intestines, such as vomiting and diarrhea.

    Other conditions have symptoms similar to the flu, such as the common cold, bacterial infections and infectious mononucleosis.

    This information does not replace the advice of a doctor. Healthwise disclaims any warranty or liability for your use of this information. To learn more visit

    © Healthwise, Incorporated.

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  • AAlan Seifer, MD, Family Medicine, answered on behalf of Baptist Health South Florida
    Chances are if you have the flu you feel some or all of these symptoms:
    • Fever or feeling feverish/chills
    •  Cough
    •  Sore throat
    •  Runny or stuffy nose
    •  Muscle or body aches
    •  Headaches
    •  Fatigue or weakness
    Some with the flu may have vomiting and diarrhea, though this is more common in children than adults. Keep in mind, you may still have the flu even if you don't have a fever. You may be able to spread the flu to someone else before you know you are sick, as well as while you are sick.
  • AUCLA Health answered
    While influenza and the common cold are both caused by respiratory viruses, flu symptoms are significantly more severe. Although both illnesses can produce runny or stuffy noses and coughs, flu symptoms often also include high fevers (over 102º F), body aches, sore throat, vomiting and diarrhea.
  • Symptoms of influenza can include:
    • fever
    • cough
    • sore throat
    • runny or stuffy nose
    • body aches
    • headache
    • chills
    • fatigue
    • some people may also have vomiting and diarrhea.
    People may be infected with the flu and have some symptoms without a fever.

    The presence of the CDC logo and CDC content on this page should not be construed to imply endorsement by the US Government of any commercial products or services, or to replace the advice of a medical professional. The mark “CDC” is licensed under authority of the PHS.
  • Symptoms of influenza (flu) can include:
    • fever
    • cough
    • sore throat
    • runny or stuffy nose
    • body aches
    • headache
    • chills
    • fatigue
    • some people may also have vomiting and diarrhea.
    People may be infected with the flu, including 2009 H1N1 flu, and have respiratory symptoms without a fever.
  • AScripps Health answered

    For most adults, the influenza virus means a week or so of fever, sore throat, cough, headache and body aches. But for children, the flu can have much more serious consequences, such as ear infections, dehydration, pneumonia or death.

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