Symptoms
By Mayo Clinic staffThe 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:
- Diarrhea
- Nausea
- Abdominal cramps
- Bloating
- Gas
Symptoms are usually mild, but they may sometimes be severe.
When to see a doctor
Make an appointment with your doctor if you or your child has any signs or symptoms that worry you.
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- Lomer MCE, et al. Review article: Lactose intolerance in clinical practice - Myths and realities. Alimentary Pharmacology & Therapeutics. 2008;27:93.
- Lactose intolerance. National Institute for Diabetes and Digestive and Kidney Diseases. http://digestive.niddk.nih.gov/ddiseases/pubs/lactoseintolerance/index.htm. Accessed Jan. 14, 2010.
- Lactose intolerance. American Gastroenterological Association. http://www.gastro.org/wmspage.cfm?parm1=854. Accessed Jan. 14, 2010.

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