SymptomsBy Mayo Clinic Staff
The signs and symptoms of lactose intolerance usually begin 30 minutes to two hours after eating or drinking foods that contain lactose. Common signs and symptoms include:
- Nausea, and sometimes, vomiting
- Abdominal cramps
When to see a doctor
Make an appointment with your doctor if you frequently have symptoms of lactose intolerance after eating dairy foods, particularly if you're worried about getting enough calcium.
Sept. 02, 2016
- Feldman M, et al. Maldigestion and malabsorption. In: Sleisenger & Fordtran's Gastrointestinal and Liver Disease: Pathophysiology, Diagnosis, Management. 10th ed. Philadelphia, Pa.: Saunders Elsevier; 2016. http://www.clinicalkey.com. Accessed March 26, 2015.
- Leavitt M, et al. Clinical implications of lactose malabsorption versus lactose intolerance. Journal of Clinical Gastroenterology. 2013;47:471.
- Montgomery RK, et al. Lactose intolerance. http://www.uptodate.com/home. Accessed March 25, 2015.
- Lactose intolerance. National Digestive Diseases Information Clearinghouse. http://digestive.niddk.nih.gov/ddiseases/pubs/lactoseintolerance/. Accessed March 26, 2015.
- Heaney, RP. Dairy intake, dietary adequacy, and lactose intolerance. Advances in Nutrition. 2013;4:151.