Drinking alcohol may cause diarrhea due to the stimulation of the gastrointestinal tract by alcohol, changes in gastrointestinal dynamics, intestinal flora imbalance, their own diseases and other reasons. 1. Alcohol stimulation of the gastrointestinal tract: alcohol can stimulate the mucous membrane of the gastrointestinal tract, too much alcohol is easy to gastrointestinal mucous membrane damage, the patient may be accompanied by burning sensation, stomach pain, diarrhea and other symptoms. 2. Altered gastrointestinal dynamics: the stimulation of the gastrointestinal tract by alcohol may affect gastrointestinal dynamics, accelerating gastrointestinal peristalsis and eventually leading to diarrhea. 3. Intestinal flora imbalance: excessive alcohol intake will destroy the intestinal microenvironment, which may lead to an increase or decrease in some of the intestinal bacteria, resulting in intestinal flora imbalance, which can also cause diarrhea. 4. own disease: if the patient himself suffers from irritable bowel syndrome, gastritis, chronic enteritis and other diseases, gastrointestinal mucosal sensitivity is higher, more likely to have diarrhea under the stimulation of alcohol, it is recommended that such patients quit drinking in a timely manner, and follow the doctor’s instructions. If the symptoms can not be relieved in a timely manner patients should seek medical attention to avoid serious consequences.