Not all cancers will lose weight, it mainly depends on the patient’s stage as well as treatment. Although cancer is a consumptive disease, early stage patients usually do not have obvious clinical manifestations, and their weight will not change significantly. Only after entering the middle or late stage, when the tumor is not dealt with in time and consumes a lot of energy, fat and nutrients in the growth of the human body, the patient will experience extreme body weight loss. In addition, when cancer is found in time and effective treatment programs are adopted to remove the cancer cells completely, the body will not lose weight; if it is found late and the treatment effect is not obvious, the body weight will be lowered with the aggravation of the disease.