Lactose intolerance is very common disease caused by the inability to digest lactose, a sugar found in milk and dairy products. The absence of lactase enzyme that digests the lactose, leads to the appearance of gastrointestinal symptoms when a milk-based product is consumed.
The term swollen belly is often used by people to describe a feeling of increased abdominal volume associated with discomfort, usually by excess gas. Not being a medical term, the "bloated belly" has no clear definition, can mean completely different situations, from a simple and innocent gas buildup to the presence of an abdominal tumor, through pregnancy and belly fat accumulation.
