Giardiasis is an infection of the small intestine caused by a parasite known as Giardia lamblia. 
Medically Reviewed by Dr Rehaam Ali Khan 


This parasite can be found in food, water, and surfaces that have been contaminated with fecal matter. Symptoms of giardiasis may include abdominal pain and cramping, nausea and vomiting, diarrhea, fatigue, weight loss, and dehydration. In some cases, individuals may experience constipation or an inability to absorb fats. 

To prevent giardiasis, it is important to practice good hygiene and cleanliness. Wash your hands thoroughly after using the restroom and before preparing food. Be sure to cook food thoroughly and store leftovers promptly in a refrigerator at 40°F (4°C) or below. Additionally, drink only bottled or boiled water if travelling to countries where tap water might not be safe for consumption. Disinfect surfaces regularly using diluted bleach solutions or hydrogen peroxide-based disinfectants; boil any potentially contaminated water for one minute prior to drinking it; do not swallow any untreated water from lakes, rivers, springs or other natural sources; use protective gear when participating in recreational water activities such as swimming; dispose of all fecal matter appropriately; wash fruits and vegetables carefully before eating them; avoid swallowing the lake water while swimming; and always maintain adequate hydration during travel.