The symptoms of serious gastric ulcer are as follows: 1. Upper gastrointestinal hemorrhage. In general, if gastric ulcer occurs in the gastric horn or sinus of the stomach and invades the submucosa, most of them easily lead to vascular erosion causing upper gastrointestinal hemorrhage, and the bleeding amount even reaches more than 1500-2000ml in some cases, which easily leads to hemorrhagic shock, and even serious ones easily lead to life threatening. 2. pyloric obstruction. Most of the lighter ones have little other obvious manifestations, but the serious ones are prone to water-electrolyte disorders, due to frequent nausea and vomiting, causing electrolyte disorders. 3, perforation. Gastric ulcer can lead to gastric perforation and acute peritonitis when it is deeper, which requires emergency surgery. 4.Cancer. Gastric ulcer is prone to carcinoma, but the chance of carcinoma is less than 1%, but most of the carcinoma will occur in the gastric horn, and the carcinoma in the gastric horn is prone to indolent cell carcinoma or low differentiated adenocarcinoma.