Infantile colic is more common and mostly occurs in infants under three months of age. It is characterized by paroxysmal crying, with the infant crying loudly for several hours. During an attack, the face often turns flush, the area around the mouth is pale, and the abdomen is bloated and tense. This is usually accompanied by tightly clenched hands, and symptoms may slightly relieve after passing gas or having a bowel movement. There are many causes of colic, often related to the infant's own constitution, especially food allergies which can exacerbate symptoms. Additionally, respiratory infections, abdominal chilling, overeating, or accumulation of intestinal gas can also trigger symptoms of colic.