If gastric cancer patients have common constipation, it can be solved by changing diet and increasing crude fiber diet, but if it is due to intestinal obstruction caused by gastric cancer, surgery may be needed to release the obstruction. 1. Stomach cancer patients are prone to constipation. Early stomach cancer surgery or late stomach cancer chemotherapy may lower the immunity of human body, leading to weakening of gastrointestinal peristalsis, and at the same time, the activity of stomach cancer patients is reduced, so constipation may occur. You can promote defecation by increasing crude fiber food, such as cabbage, celery, etc. In serious cases, you can use Keflex to promote defecation. 2. Intestinal obstruction caused by gastric cancer, when the tumor of gastric cancer is relatively large or grows bigger near the pylorus, it may cause intestinal obstruction, and it may also cause obstruction due to the pressure on colon, in this case, according to the doctor’s assessment, the gastric cancer can be removed through surgery to achieve the purpose of eliminating intestinal obstruction. Therefore, once this situation occurs, you need to contact your doctor as soon as possible to find out the cause and apply a targeted approach to it.