Early stage stomach cancer patients usually have no obvious symptoms, and some of them may have mild symptoms similar to gastritis or ulcer disease, so it is suggested that they should consult doctor in time. Some early gastric cancer patients may have symptoms similar to gastritis or ulcer disease, including epigastric fullness, epigastric pain, loss of appetite, acid reflux, nausea, belching, vomiting and black stools, etc., which are usually mild and easy to be ignored. With the development of lesions, patients may have stomach pain, weight loss, anemia, fatigue, gastrointestinal bleeding, diarrhea and other discomforts, and if it develops to advanced gastric cancer, patients may show severe emaciation, edema, fever, jaundice, anemia and so on. If patients have the above symptoms and suspect stomach cancer, it is recommended that they should consult doctor in time to improve relevant examinations, such as tumor marker, ultrasound, CT, pathological examination, etc., so as to make a clear diagnosis as soon as possible and take active treatment, so as to avoid delaying the condition.