Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs GiardiaUpdated: 2017-06-13OverviewGiardiasis spreads through contaminated food or water or by person-to-person contact. It's most common in areas with poor sanitation and unsafe water. SymptomsSymptoms might include watery diarrhea alternating with greasy stools. Fatigue, cramps, and belching gas also may occur. Some people have no symptoms. TreatmentsMost cases clear up on their own within a few weeks. Severe cases are treated with antibiotics. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use