Colic is a very common, very intense pain. Initially described as pain in the colon, its use has now been extended to define pain in many abdominal organs, such as renal colic, affecting the kidney, or liver colic in the biliary tract. It may be caused by food, toxins, physiological or psychological disorders. The treatment depends on the cause. The term colic is also frequently used in infants to describe feelings of discomfort and pain in the digestive tract which cause crying; they are very common and disappear without treatment by the age of 4 months.