胃癌是人类最常见的恶性肿瘤之一,它是指发生于贲门、胃体及幽门部位的恶性肿瘤。病因尚不清楚,可能与土壤环境、食物、饮食习惯、遗传及胃部疾病如消化性溃疡、慢性胃炎、胃息肉等有关。胃癌早期可无症状或症状轻微,至中、晚期可出现上腹疼痛、包块、呕吐、吐血或黑便等。预防 Gastric cancer is one of the most common malignant tumors in humans. It refers to malignant tumors that occur in the cardiac, gastric, and pyloric regions. The etiology is unclear and may be related to the soil environment, food, dietary habits, genetics, and stomach diseases such as peptic ulcers, chronic gastritis, and gastric polyps. Early gastric cancer may be asymptomatic or have mild symptoms. Up to mid- to late-stage, upper abdominal pain, masses, vomiting, vomiting, or melena may occur. prevention