When abdominal metastasis with serious intestinal obstruction and abdominal fluid accumulation occurs in the late stage of gastric cancer, it can still be treated, but the purpose of treatment is to prolong the life span and alleviate the pain, and it cannot achieve the curative effect. Advanced gastric cancer will cause serious loss of gastrointestinal digestive function and local tissue necrosis, and if it is accompanied by abdominal metastasis, serious intestinal obstruction and peritoneal fluid accumulation and other complications, it will directly affect the patient’s life expectancy and make him/her suffer from recurring abdominal pain, abdominal distension, inability to eat normally, which is a serious manifestation of advanced cancer, and it is impossible to be cured completely. For advanced cancer and multiple complications, the treatment plan mainly aims at alleviating pain and prolonging the survival time, local drainage of peritoneal fluid can be carried out, radiotherapy and chemotherapy can be carried out for metastatic sites and primary foci to effectively control the proliferation of cancer cells, and dietary supplements of high-quality proteins and vitamins can be provided to enhance the body quality. For people with advanced gastric cancer or multiple complications, they need to go to hospital for treatment as soon as possible.