Stomach cancer cannot be diagnosed by self-examination, but it can be initially judged based on some clinical manifestations. For a definite diagnosis of gastric cancer, you need to go to a hospital for gastroscopy, barium meal X-ray and other related examinations to determine whether there is gastric cancer according to the examination results. Common clinical manifestations: Some patients with early stage gastric cancer have no specific symptoms, but some patients may have such manifestations as upper abdominal distension and pain, weakness, loss of appetite, vomiting blood and blood in stool. Progressive gastric cancer patients may have upper abdominal pain, distention and vomiting after eating, upper gastrointestinal bleeding, difficulty in swallowing, anemia and weight loss. Patients with advanced gastric cancer may have a combination of ascites, pyloric obstruction, left supraclavicular lymph node enlargement, hepatomegaly, jaundice and pleural effusion, etc. Clinical examination: 1. Gastroscopy: Gastroscopy can be used to directly observe the gastric mucosa of gastric cancer patients and take away the lesion tissue for pathological biopsy to determine the specific nature, which can improve the detection rate of early gastric cancer, and gastroscopy is the preferred method for gastric cancer patients; 2. 3.CT examination: Under CT examination, patients with gastric cancer can see irregular thickening of the gastric wall, ulceration and mucosal fold changes in part of the gastric wall, so as to determine the extent of the lesion and whether regional lymph node metastasis and distant metastasis have occurred, and to judge the severity of the disease; 4.Laboratory examination: Most of the tests are blood routine, fecal occult blood test and carcinoembryonic antigen, etc. Hemoglobin can Hemoglobin can determine whether the patient has anemia and the severity of anemia. A positive fecal occult blood test can reveal the presence of gastrointestinal bleeding. Elevated carcinoembryonic antigen also indicates the possibility of gastric cancer, which is an auxiliary test. For example, some patients with progressive gastric cancer may have abdominal masses and abdominal pain, which can be detected by abdominal palpation in time. It is recommended that patients who are suspected of stomach cancer should seek medical examination in time for early detection and treatment.