Abdominal pain is a common clinical symptom and a reason for prompting patients to seek medical attention. Most abdominal pain is caused by some kind of strong irritation or injury to intra-abdominal tissues or organs, but it can also be caused by chest diseases and systemic diseases. In addition, abdominal pain is a subjective sensation, and the nature and intensity of abdominal pain are influenced not only by the condition of the lesion and the degree of irritation, but also by neurological and psychological factors. That is, there are differences in the sensitivity of patients to painful stimuli, and the nature, intensity and duration of abdominal pain caused by the stimuli of the same lesion differ in different patients or in different periods of the same patient. Therefore, a proper understanding of abdominal pain is only possible by dissecting the pathophysiology, neurophysiology, psychology and clinical aspects of the disease. Abdominal pain is often clinically divided into two categories: acute and chronic.