Why do I get an upset stomach after eating yogurt?

Yogurt is a dairy product, and some people are lactose intolerant or have a sensitivity to the protein in milk, called casein. Lactose intolerance occurs when the body does not produce enough of the enzyme lactase, which helps to digest the sugar in milk. Casein intolerance is less common but can also cause digestive problems. Symptoms of lactose intolerance and casein intolerance include bloating, gas, abdominal pain, nausea, and diarrhea.

If you experience an upset stomach after eating yogurt or other dairy products, it is possible that you are lactose intolerant or have a casein sensitivity. You can talk to your doctor to confirm if this is the case, and they can recommend ways to manage your symptoms. Some people with lactose intolerance and casein intolerance can still enjoy dairy products by choosing lactose-free and casein-free options or by taking lactase enzyme supplements.