Giardiasis (Giardia Lamblia Infection): Symptoms & Signs

Medically Reviewed on 9/10/2019

Signs and symptoms of giardiasis can vary, and some people may be infected without showing any symptoms. Symptoms, when they occur, can last two weeks or longer. The most common symptoms are

  • diarrhea,
  • gas,
  • fatty or foul-smelling stools (they may float), and
  • stomach or abdominal cramping.

Nausea and vomiting may occur along with malaise, fatigue, and bloating. The symptoms together can lead to dehydration. Less common symptoms may include

If untreated, the infection can persist for months to years. Over time, giardiasis can cause weight loss, malnutrition, and delayed development in children.

Causes of giardiasis

Giardiasis is caused by infection with the Giardia lamblia parasite.

Related Symptoms & Signs

Other giardiasis symptoms and signs

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Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.