Low fever of liver tumor may be caused by tumor secretion of necrosis factor, tumor-induced autonomic nervous system dysfunction, low fever after liver infection, mental tension and anxiety. 1. Tumor secretion of necrosis factor: tumor necrosis factor secreted by tumor and stimulation of cancer cells itself will stimulate the thermoregulatory center and cause low fever. 2. Tumor-induced autonomic dysfunction: tumor-induced associated cancer syndrome may cause autonomic dysfunction, affecting the normal thermoregulation process and leading to hypothermia. 3. Hypothermia after liver infection: if liver cancer is combined with infection, hypothermia can be caused by inflammatory factors. 4. Mental tension and anxiety: after suffering from cancer, mental tension and anxiety can cause nervous low fever. When liver tumor with low fever appears, it is recommended to go to hospital for consultation in time.