Why does drinking beer cause diarrhea, and what should be done about it?

Diarrhea usually refers to loose or frequent bowel movements. Generally, the main causes of diarrhea after drinking beer include excessively cold beer temperature, carbonation irritation in beer, lactose intolerance, chronic enteritis, and irritable bowel syndrome (IBS). If discomfort occurs, it is recommended to seek timely medical evaluation and treatment at a正规 hospital. Detailed explanations are as follows:

1. Beer temperature too low

Chilled beer that is too cold can stimulate the gastrointestinal mucosa upon entering the digestive tract, accelerating intestinal motility and impairing digestion and absorption of food, thus triggering diarrhea. It is advisable to drink beer at room temperature and avoid consuming ice-cold beer on an empty stomach. If cold beer has already been consumed, drinking warm water may help alleviate gastrointestinal irritation and reduce the likelihood of diarrhea.

2. Carbonation irritation in beer

Beer contains a large amount of carbon dioxide gas. After consumption, this gas accumulates in the gastrointestinal tract, increasing pressure on the gut walls and stimulating intestinal motility, which may lead to bloating and diarrhea. To minimize these effects, drink slowly and avoid rapid or excessive intake to reduce gas accumulation. Consuming light foods alongside beer can also help reduce the burden on the digestive system.

3. Lactose intolerance

Beer is brewed from malt and contains small amounts of lactose. Individuals with lactose intolerance lack sufficient lactase enzyme to break down lactose, leading to fermentation of undigested lactose in the intestine, which produces gas and fluid and triggers diarrhea. Those affected should avoid beer and consider lactose-free beverages instead. During episodes of diarrhea, medications such as Bifidobacterium quadruple live bacteria tablets, Lactasin tablets, or Bacillus subtilis bivalent live bacterial granules may be taken under medical guidance to regulate intestinal flora.

4. Chronic enteritis

In individuals with chronic intestinal inflammation, the intestinal mucosa is already sensitive. Components in beer—especially alcohol—can further irritate the mucosa, exacerbate inflammatory responses, disrupt normal intestinal motility, and cause diarrhea. Under medical supervision, patients may take medications such as sulfasalazine enteric-coated tablets, mesalazine enteric-coated tablets, or compound berberine tablets. Alcohol should be avoided during treatment, and the diet should focus on light, easily digestible foods.

5. Irritable bowel syndrome (IBS)

Patients with IBS have disordered intestinal function. Substances in beer such as alcohol and caffeine can stimulate the intestines, trigger spasms, and cause abnormal motility, resulting in diarrhea. Under medical guidance, medications like pinaverium bromide tablets, trimebutine maleate tablets, or montmorillonite powder may be used. Affected individuals should avoid beer and spicy or irritating foods, and maintain emotional stability.

In daily life, individuals should decide whether to drink beer based on their personal health condition and avoid excessive alcohol consumption. Attention should be paid to dietary hygiene and regular eating habits. If diarrhea frequently occurs after drinking beer, prompt medical consultation is advised to identify underlying causes. Maintaining healthy lifestyle habits can strengthen gastrointestinal function.