Worldwide, a substantial proportion of people experience lactose intolerance due to deficiency of lactase enzyme. It is characterised by a range of discomforts including abdominal pain, bloating, diarrhoea and nausea. Children may experience lactose intolerance after an episode of acute diarrhoea. Dietary management of both the conditions then becomes important as choosing the right foods can avoid exacerbation of the symptoms. This ‘Frequently Asked Questions’ series on Lactose Intolerance in Diarrhoea will help answer several questions revolving around the management of this condition among children.