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A 17-year-old female asked:

My brother since he was a child has diarrhea, and now he is 20 years old and the diarrhea didn't stop. what can it be?

2 doctor answers3 doctors weighed in
Dr. Oscar Novick
Pediatrics 58 years experience
Diarrhea: Your brother may have a food intolerance in the form of lactose, fructose or sucrose intolerance. He needs a workup from a gastroenterologist.
Dr. Charles Maletz
Family Medicine 39 years experience
Malabsorption: He may have a life-long parasitic infection or possibly a malabsorption condition . An example of the latter would be lactose intolerance where the inability to absorb the sugar lactose , present in all diary products will produce chronic , life-long diarrhea. His stool could easily be tested for both of these.

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Last updated May 17, 2014

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