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.