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By Mayo Clinic staffDiarrhea that goes away within a week or less probably isn't giardiasis. Call your doctor if you have loose stools, abdominal bloating and nausea lasting two weeks or more, or you become dehydrated. It's easy to overlook giardiasis because the signs and symptoms resemble those of other gastrointestinal diseases. Be sure to tell your doctor if you have a child in child care, you've recently traveled to an endemic area, or you've swallowed water from a lake or stream.