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Both common colds and flu are caused by viruses, and both are respiratory infections. Because colds and flu share many symptoms, it can be difficult (or even impossible) to tell the difference between them based on symptoms alone. Special tests can tell if a person is sick with flu. What are the symptoms of flu versus the symptoms of a cold?

The symptoms of flu can include fever or feeling feverish/chills, cough, sore throat, runny or stuffy nose, muscle or body aches, headaches, and fatigue (tiredness). Cold symptoms are usually milder than the symptoms of flu. People with colds are more likely to have a runny or stuffy nose. Colds generally do not result in serious health problems.

The following symptoms can be present in flu, but generally aren't present in a cold: • Running a fever (temperature of 100.4ºF or higher) • Severe muscle aches • Severe fatigue • Nausea and vomiting • Diarrhea and/or stomach pains The other difference between the two is longevity. While colds might only last for a few days, up to a week or so in the majority of cases, flu symptoms can be present for up to two weeks.