Visceral pain is a common clinical condition. The pathogenesis of visceral pain is poorly understood and is mainly caused by visceral organ disorders, including dilatation, ischemia, inflammation, and stretching of the mesentery. Causes: Visceral pain is mainly caused by disorders of the visceral organs, including dilatation, ischemia, inflammation, and traction of the mesentery. Patients often exhibit a combination of symptoms such as nausea, fever, malaise, and pain. There are five main clinical features of visceral pain: First, not all visceral organs are painful due to uneven distribution of receptors or lack of appropriate injurious stimuli. Second, visceral pain is not always associated with injury, i.e., visceral pain has a non-structure-dependent, non-function-dependent nature. Third, because there is central convergence of visceral and somatic afferent nerves, visceral pain is often involved in the body wall. Fourth, it may be related to the distribution of afferent nerves, and visceral pain is rarely confined to a particular site and is diffuse. Fifth, visceral pain is often accompanied by significant motor and autonomic reflex activity, which is likely a stress response of the body to the external world.