Gastric tumor is a general term for a class of diseases, which refers to tumors occurring in the stomach, including malignant tumors and benign tumors of the stomach; patients with different tumors feel different, malignant tumors include gastric cancer, gastric lymphoma, larger mesenchymal tumors of the stomach, etc., benign tumors include smooth muscle tumors, lipomas, etc. The main analysis is as follows: I. Malignant tumors 1. In the early stage, patients with gastric cancer may show non-specific upper gastrointestinal symptoms such as upper abdominal discomfort, fullness and nausea after eating; as the disease progresses, patients may experience pain in the upper abdomen, which may manifest as hidden pain, deep pressure pain, distention pain, burning pain, etc., and may also experience loss of appetite, weakness, emaciation and weight loss. When the tumor ruptures or invades the perigastric vessels, symptoms of gastrointestinal bleeding such as vomiting blood and black stool may appear; acute perforation may also occur; 2. Gastric lymphoma: primary gastric lymphoma is the most common type of extra-nodal lymphoma; the common symptom of gastric lymphoma is epigastric pain, which is manifested as hidden pain and distension, accompanied by nausea, vomiting, weight loss, gastrointestinal bleeding and anemia; some patients may have palpable lumps in the upper abdomen. Some patients may have palpable mass in the upper abdomen, and a few patients may have irregular fever; 3. Gastric mesenchymal tumor: it is the most common mesenchymal-derived tumor in the digestive tract, and the common clinical manifestations are abdominal discomfort, vague pain or abdominal mass, followed by gastrointestinal bleeding caused by the tumor, which may manifest as black stool. Benign tumor 1. Smooth muscle tumor: It is a benign tumor originated from smooth muscle cells of skin or mucous membrane, with clinical manifestations of swelling in skin or internal organs of human body, pain and other symptoms in swelling and its surrounding tissues; 2. Lipoma: It is a tumor of normal fat-like tissue, when the tumor is large, it can produce compression symptoms, making patients feel pain and nausea.