People may feel very sick and vomit many times a day, but most people get better within 1 or 2 days, and they have no long-term health effects related to their illness. However, sometimes people are unable to drink enough liquids to replace the liquids they lost because of vomiting and diarrhea. These persons can become dehydrated (lose too much water from their body) and may need special medical attention. During norovirus infection, this problem with dehyrdration is usually only seen among the very young, the elderly, and people with other illness. (For more information see Is there a treatment for norovirus infection?)
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