Our expert says:
Alcohol can cause inflammation of your stomach lining (gastritis), leading to nausea, vomiting and stomach pain due to the chemical irritation and because it stimulates acid production. Some people are more sensitive than others. The diarrhoea happens because alcohol causes your small bowel to absorb less water and propel its contents along more quickly.
He should really try not to drink excessively and to always eat something fatty before taking a drink as this will delay the movement of the alcohol through the bowel.
You can try Mucaine for the stomach ache, and Kaopektin for the runny tummy.
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