The common causes of upper gastrointestinal bleeding mainly include the following points:

First, esophageal diseases, such as esophagitis, Mallory-Weiss syndrome.

Secondly, peptic ulcers, gastric cancer, acute erosive hemorrhagic gastritis, and then esophageal gastric variceal rupture caused by portal hypertension.

There are also diseases of neighboring organs or tissues of the upper digestive tract, such as biliary bleeding, pancreatic diseases involving the duodenum, such as pancreatic cancer, acute pancreatitis complicated by abscess rupture and bleeding.

Additionally, there are systemic diseases, such as allergic purpura, hemophilia, leukemia, etc.