Sep 22, 2025 · Lactose intolerance happens when the small intestine doesn't produce enough of an enzyme called lactase. Lactase is necessary to digest milk sugar, called lactose.

Sep 22, 2025 · A healthcare professional might suspect lactose intolerance based on someone's symptoms and response to reducing the amount of dairy foods in the diet. A diagnosis can be …

Jun 14, 2016 · Lactose intolerance results from a problem with the carbohydrate lactose, a type of sugar found in dairy products. When you eat or drink dairy products, enzymes in your small …

Feb 28, 2024 · Physical reactions to certain foods are common, but most are caused by a food intolerance rather than a food allergy. A food intolerance can cause some of the same signs …

Sep 19, 2025 · Unlike milk allergy, intolerance doesn't involve the immune system. Milk intolerance requires different treatment from true milk allergy. Common symptoms of milk …

Jun 21, 2022 · “While we are not sure yet, there are several possible ways the COVID-19 infection could cause gastrointestinal problems,” Dr. Vanichkachorn says. “For example, the lining of …

Aug 26, 2011 · Lactose intolerance is the inability to fully digest lactose, the sugar that's in milk and other milk products. This is caused by a deficiency of lactase, an enzyme that's …

Dec 23, 2025 · Damage to your small intestine might cause you belly pain and diarrhea after eating or drinking dairy products that contain lactose. Once your intestine has healed, you …

Sep 20, 2025 · Failure to thrive. Continuing loose stools from giardia infection can lead to poor nutrition. This can harm children's physical and mental growth. Lactose intolerance. Many …

Feb 9, 2025 · I have dealt with lactose intolerance most of my life. When diagnosed, my doctor told me it can occur after an illness, with your body losing the ability to manufacture the …