Gastrointestinal bleeding is most commonly caused by diseases of the upper gastrointestinal tract, mainly due to peptic ulcers, which are more common in young and middle-aged people, specifically gastric ulcers and duodenal ulcers, because the repeated attacks of ulcers can invade the blood vessels of the submucosa and lead to blood vessel rupture and bleeding, which is also one of the most common complications of peptic ulcers. Acute blood loss will be marked by hypotension and shock, with wet, cold, and sweaty periphery, and should be followed by urgent volume expansion and, if necessary, blood transfusion. Repeated attacks also tend to induce anemia, so the most effective treatment is to opt for surgery to remove the ulcerated lesion. After surgery, symptomatic treatment such as anti-infection is also needed, while for relatively mild peptic ulcers, conservative treatment options are also available, with the application of proton pump inhibitors, which can be controlled to some extent in many patients, and attention should be paid to the diet structure during pregnancy to avoid overeating.