Abdominal pains, bloating, diarrhoea and a feeling of overflowing in your intestines are keeping you up at night? You may be suffering from lactose intolerance, the sugar contained in milk. On average, one in three Poles suffers from it, i.e. around 37% of the population. Simply giving up milk does not solve the problem. You still need to undergo tests to determine the cause of your lactose intolerance, and there may be several causes.