Many patients suffering from chronic gastritis, in the gastrointestinal examination, the doctor will take a biopsy of the examination, mainly for the following two reasons: first, observation of local tissues, biopsy, will be local tissues, take out and send to the examination. This method is mainly for the doctors to observe the local mucous membrane with cancerous changes, or can not be clearly changed, like some patients with gastric polyps, in the early stage, the polyps will not change, but in the late stage, the polyps have already appeared cancerous, the doctor will take a biopsy of the polyps and send it to the pathology department for examination to assess whether it has been cancerous or not. Secondly, treatment, doctors will take biopsy at the same time of surgery, and the pathology department produces the result faster, doctors will then perform surgical excision treatment on the lesion after the result is produced, which is more accurate and avoids the harm caused to the patient by the second surgery.