Staying up late is not a direct cause of liver cancer, but it is a contributing factor to many causes. Prolonged staying up late and poor sleep quality will cause immune disorders and low immunity, together with various pro-cancer factors, can lead to the expression of oncogenes and the inhibition of oncogenes, which will then develop into liver cancer. At present, the causes of many kinds of tumors are unknown. For example, the occurrence of liver cancer is related to viral infection, alcohol consumption, eating moldy food, parasitic infection, exposure to toxins, genetic factors, diet and living habits. Nowadays, the pressure of social life is great, especially many young people stay up late for a long time for work, even staying up all night, with serious lack of sleep, and the immune function of the body decreases dramatically, which leads to the occurrence of many tumors at a younger age. It is important to emphasize the regularity of life and work, avoid staying up late, drinking, smoking, as well as overeating and other undesirable stimuli to ensure good health.