Early stage of liver cancer may have transient weight gain, but with the progression of the disease, weight loss will mostly occur. Liver cancer is a malignant tumor and a consumptive disease. However, some patients with early stage of liver cancer may have transient weight gain due to increased liver size and ascites, which is usually of small magnitude. As the disease progresses, patients will experience persistent loss of appetite, nausea, vomiting, high fever and other symptoms, and begin to lose weight rapidly. Cancer cells in early stage cancer patients can be effectively controlled after surgical resection. At this time, if cancer patients can ensure a basic normal diet and proper nutrition, their weight may return to the pre-operative level. Normally, they can eat more light food and more green fresh fruits and vegetables to promote intestinal peristalsis and digestion. Meanwhile, pay attention to rest during treatment, avoid fatigue and staying up late, strengthen physical exercise appropriately, and actively cooperate with doctors.