Internal injuries are clinically known as closed abdominal injuries. The incubation period of internal injury after being kicked in the stomach is related to the severity of the patient’s injury. In more severe abdominal injuries, patients may experience immediate nausea, vomiting of blood, abdominal pain, and other uncomfortable symptoms. Less severely injured patients may experience symptoms after 24 hours, or even 1-2 weeks. In closed injuries caused by violence such as being kicked in the stomach, the commonly injured organs are the spleen, kidney, small intestine, liver, mesentery, etc. The pancreas, duodenum, diaphragm, rectum, etc. are located deeper and have a low incidence of injury. When the abdomen is struck by a large external force, the patient may experience immediate discomfort due to injury to the organs in the abdominal cavity. Patients may also just have contusions of the organs, and the symptoms may not be obvious because the organs may be wrapped by the peritoneum, but when the bleeding gradually increases, it may suddenly transform into a true rupture under the influence of certain external forces, which may occur at the time 1-2 weeks after the injury. When abdominal injuries are combined with visceral injuries, most patients require surgical treatment. Patients with open abdominal injuries often receive prompt treatment in the first instance because of the obvious wounds on the body surface. Patients with closed abdominal injuries have some difficulty in determining visceral injury early because there is no wound on the body surface, and failure to determine whether viscera are damaged at an early stage is likely to delay surgery and lead to serious consequences.