Colic is a term used to describe severe, often fluctuating pain in the abdomen that is caused by the intestine or other parts of the digestive tract undergoing spasms. It can occur in both adults and infants, with infant colic typically characterized by excessive crying and fussiness without an obvious cause. In adults, colic can be associated with conditions like gallstones or kidney stones, where blockages lead to intense pain. Treatment often focuses on addressing the underlying cause and may include medications, dietary changes, or other interventions to relieve discomfort.