Sep 22, 2025 · Lactose intolerance is a condition that makes it hard to digest the sugar in milk and milk products, called lactose. People with lactose intolerance often have diarrhea, gas and bloating after …

Mar 3, 2023 · Lactose intolerance occurs in people who lack the enzyme they need to break down lactose, the sugar in milk. It causes digestive distress when you eat dairy products.

The principal manifestation of lactose intolerance is an adverse reaction to products containing lactose (primarily milk), including abdominal bloating and cramps, flatulence, diarrhea, nausea, borborygmi, …

Feb 22, 2024 · 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 an inability to digest lactose, a sugar found in milk and milk products. This condition often runs in families and can affect both children and adults. Lactose intolerance is most …

Oct 21, 2025 · Learn about the symptoms, diagnosis, and treatment of an intolerance to the natural sugar in milk and how lactose intolerance differs from allergy.

Sep 28, 2025 · Lactose intolerance is a condition that results in uncomfortable digestive symptoms after you consume foods or drinks that contain lactose—or a sugar that is naturally found in dairy products.

Lactose intolerance is caused by lactose malabsorption. If you have lactose malabsorption, your small intestine makes low levels of lactase—the enzyme that breaks down lactose—and can’t digest all the …

Lactose Intolerance - Learn about the causes, symptoms, diagnosis & treatment from the Merck Manuals - Medical Consumer Version.

Apr 7, 2023 · What is it? Lactose intolerance is a common cause of abdominal cramping, bloating and loose stools. This condition occurs when the body does not have enough of the intestinal enzyme …