Millions of Americans can’t digest a certain sugar in milk and milk products called lactose. If you’re one of them, you have lactose intolerance. The condition isn’t harmful, but it can be ...

Lactose intolerance is the inability to break down a type of natural sugar called lactose. Lactose is commonly found in dairy products, such as milk and yogurt. You become lactose intolerant when your ...

Lactose intolerance is caused by a deficiency in lactase — the enzyme that breaks down the sugar in milk, called lactose. Common symptoms include bloating, abdominal cramps, nausea, and diarrhea. If ...

People develop lactose intolerance when their bodies don’t make enough of the enzyme lactase for the amount of dairy they consume, says Dr. Christopher Schmoyer, an assistant professor of ...