The first one is fever. There are many reasons for fever, such as bacterial and viral infections, and functional fever. The second is pain, which is the most common symptom of advanced malignant tumors including gastric cancer. The third one is cachexia, also called cachexia, which refers to the clinical manifestations of patients with advanced malignant tumors, such as extreme emaciation, mental depression and physical weakness. There are 3 reasons for this: 1. Malignant tumor itself is also a chronic wasting disease, due to the abnormal and rapid appreciation of cancer cells, resulting in higher nutritional needs of tumor patients than normal people, thus affecting the functions of other organs in the body. 2. Cancer itself produces toxic substances, causing disorders in the gastrointestinal tract of patients, thus affecting digestion and absorption, and thus affecting the functions of the body. 3. Tumor presses or invades adjacent important organs, thus affecting the physiological and anatomical functions of a certain tissue or organ of an individual.