Diarrhoea after drinking alcohol

Alcohol can draw fluid into the bowel and make the intestines contract more quickly, leaving less time for water to be absorbed. Large amounts, sugary mixers, beer, and drinks containing caffeine may be harder for some people to tolerate. Drinking can also lead to rich meals or foods that normally upset your stomach. If symptoms recur with a particular ingredient, Food Intolerance may be relevant. A short-lived episode with vomiting or cramps can fit Gastroenteritis or Food Poisoning, while ongoing or unexplained diarrhoea needs assessment for conditions such as Irritable Bowel Syndrome, Coeliac Disease, Crohn's Disease, or Hyperthyroidism.

Pause alcohol until your bowel movements have settled. Take frequent small sips of water; an oral rehydration drink can replace fluid and salts when losses are substantial. Eat simple foods if hungry, and avoid greasy meals, very spicy foods, and more alcohol for the moment. Record the drink, mixer, food, timing, and other symptoms. Do not use anti-diarrhoeal medicine if you have blood in the stool or a fever without checking with a clinician.

Seek urgent medical help for severe or worsening abdominal pain, fainting, confusion, inability to keep fluids down, black or bloody stools, or signs of marked dehydration such as very little urine. Arrange medical advice if episodes keep returning, continue after stopping alcohol, wake you at night, or come with weight loss, fever, or persistent vomiting. If alcohol use is difficult to control, mention that openly; support is available.

Which drinks or ingredients could be triggering this? Could my medicines, bowel pattern, or another condition contribute? Do I need tests if the episodes recur? How should I replace fluids safely?