I. Doubt and denial period When the patient suddenly learns the diagnosis of cancer, he or she tries to achieve psychological balance by denying it, suspecting the doctor’s diagnosis is wrong or the examination is wrong. Once the diagnosis of cancer is confirmed, the patient will immediately feel infinite anger and injustice towards everything in the world, and feel abandoned by life and caught by fate. The patient will take out this anger to the people around him/her. For example, the patient often shows anger and jealousy for various reasons, often quarrels with relatives and medical staff, and feels that everything is not as good as it should be, and that everyone is treating him badly and wronging him. The same into the fear that people around him abandoned him. The performance of these psychological behaviors such as: loud, a hundred reports of anger, indignation, such emotions continue to fluctuate, will consume the patient’s energy to overcome the disease and normal life. When patients think of their unfinished work and career, the life and future of their relatives and children, and everything at home that they cannot take care of, they will feel unspeakable pain and sadness from the bottom of their hearts during the treatment or recuperation process. Once this psychology is created, they may take various means to end their lives prematurely. Fourth, the period of emotional sublimation There are also many cancer patients who, although they have many kinds of psychological conflicts, can eventually realize that reality cannot be changed and fear of death is useless, but can face reality with a calm mood, live a fuller and more valuable life, and realize their wishes and ideals in a short and limited time, which is sublimation, sublimation into positive psychological preventive reaction, and patients turn negative psychology into positive effect to bring the psyche into balance through vicarious compensation. Patients in a positive psychological state will not only be psychologically balanced, but also their physical state will develop in a good direction with the change of psychological state.