No deliberate weight loss, but weight loss gradually, may be due to the decline of gastrointestinal function or cancer, gastrointestinal dysfunction is easy to lead to the lack of absorption of nutrients in the human body, resulting in long-term malnutrition, prone to abdominal pain, diarrhea symptoms, prone to lead to weight loss. It is necessary to adjust the living and eating habits and improve the function of the gastrointestinal tract. If one suffers from cancer, along with weight loss, there will also be symptoms of generalized weakness and powerlessness, qi deficiency, and easy bleeding, because the cancer factor constantly violates the immune system, leading to a decrease in the content of immune factor and the content of blood cells is in a state of lack, so that once bleeding is done it will not be easy to be healed, and the time of clotting will be greatly prolonged. Inability to perform any activities in the late stage of cancer seriously affects the quality of life and even triggers life-threatening situations.