Include milk in your diet to provide the necessary calcium and nutrients for strong bones, hormone production and other functions. Although dairy products are beneficial, they may be harmful to some people. Intestinal problems or intolerance to milk can lead to severe pain and abdominal cramps. If milk makes your stomach uncomfortable, stop drinking milk immediately and see a doctor. Your doctor may want to have a test to determine the underlying cause.
Lactose intolerance is a condition in which the small intestine does not produce enough lactase. This enzyme is necessary for the decomposition of complex lactose or lactose. Because your body can't digest dairy products, you may experience unpleasant effects when dairy products pass through your small intestine and close to your abdomen. The National Biotechnology Information Center explains that severe abdominal cramps can occur anywhere from 30 minutes to 2 hours after you eat milk or dairy products. In addition to stomachache, you may also have abdominal distension, diarrhea and flatulence. Milk allergy is different from lactose intolerance. This happens when your immune system overreacts and treats milk as a foreign substance. Within minutes of eating milk or milk-containing foods, you may start to wheeze or develop measles. When milk passes through the digestive tract, you may experience abdominal pain, diarrhea or itching of the skin. Milk allergy is more common in children than in adults. According to the Mayo Clinic, children are usually not allergic to milk at the age of three.