Many people will have diarrhea when drinking milk, the stool is thin, can be green, can have foam, etc., the number of stools increased significantly, this is actually the most typical performance of lactose intolerance. In addition to diarrhea, there are many clinical manifestations of lactose intolerance, as follows: 1. abdominal cramps and vomiting: abdominal cramps are specifically manifested as spasmodic pain in the abdomen, short in duration but high in frequency, which is also one of the symptoms of lactose intolerance. This is one of the symptoms of lactose intolerance. It usually occurs more than an hour after consuming dairy products, while severe patients may have abdominal cramps in 20 to 30 minutes. The abdominal pain or spasm causes stomach irritation, which results in vomiting. 2, abdominal distension: abdominal distension is due to the inability to absorb lactose, resulting in gas in the intestinal tract makes the abdomen bloated, specifically manifested as abdominal distension and pain, and frequent farts. Some serious patients will have a hard and painful abdomen. Finally, lactose intolerance is more common in infancy, or due to diarrhea secondary to lactose intolerance, for breast-fed babies can try lactase, if the symptoms are relieved after taking lactase also supports lactose intolerance, formula-fed babies can choose lactose-free formula.