Weight changes in small cell lung cancer are likely to be more pronounced, mainly in the form of weight loss, and are particularly noticeable in small cell lung cancer that has reached an advanced stage. Small cell lung cancer is a relatively common type of lung cancer. Due to the continuous growth of the tumor, it will accelerate the consumption of nutrients in the body, causing more serious emaciation, anemia and cachexia. The more the cancer reaches the late stage, the more obvious the weight loss will be, and it will show a rapid decline in a short period of time. In the late stage of small cell lung cancer, there will be metastasis of central nervous system, which will be manifested as headache, nausea, vomiting, etc., which will affect the patient’s appetite and also cause weight loss. It is recommended to go to the corresponding department of the hospital in time, standardize the treatment under the doctor’s guidance, pay attention to balanced nutrition in weekdays, mostly take fluids as the mainstay, and do physical exercise appropriately.