Cancer patients who are violently thin can maintain weight stability by exercising reasonably, supplementing high-quality protein and adjusting psychological state. 1. Reasonable exercise: In the process of fighting against cancer, cancer patients usually have weak body and low resistance. Aerobic breathing exercise such as jogging or walking for a short period of time can be used to enhance one’s physique, ensure sufficient supply of oxygen to the cells in the body, and maintain stable body weight. 2. Supplement high-quality protein: Cancer patients suffer from malnutrition and extreme weight loss due to decreased appetite, reduced digestive function and increased consumption. They can consume protein powder, walnuts, pine nuts and other foods rich in high-quality protein in moderation to maintain stable body weight and nitrogen balance. 3. Adjustment of psychological state: In the process of fighting cancer, cancer patients’ toxic side effects and poor psychological state accompanying treatment further aggravate weight loss. Therefore, it is necessary to adjust the psychological state, frequently remind oneself to maintain a positive attitude and alleviate the feeling of loneliness as a way to alleviate the symptoms. When patients have symptoms of extreme weight loss, they need to go to the hospital in time, and improve the treatment under the doctor’s guidance after clear diagnosis.