One: Cancer is indeed one of the major factors threatening human life, but cancer is not equal to death, it is preventable and treatable. There are many people around us who have been diagnosed with cancer and still live for 5, 10 or even decades. Therefore, cancer is not so scary. What is scary is the lack of knowledge and correct understanding of cancer. Especially the panic psychology when facing cancer. It is not possible to deal with it actively. Psychological changes of cancer patients: 1. Shock and fear: When a patient first learns that he or she has cancer, he or she will be shocked and afraid, accompanied by panic, dizziness and fainting, or even stiffness. 2. Denial and doubt: When a patient calms down from the intense emotional shock, he or she will respond with the help of denial mechanism. 3. Anger-depression: When the patient cannot change the diagnosis of cancer, he/she will become easily agitated, angry and even aggressive; at the same time, he/she will feel sad and depressed, desperate, and some of them will have light thoughts or suicidal behaviors. The patient will enter into chronic depression and pain. In addition, the side effects of cancer treatment will also have an impact on the patient’s psychology. Psychological factor is an important factor in the development of cancer, such as fear, anger, anxiety, depression, etc. Long-term stress will lead to the decrease of immunity, and the decrease of immunity will lead to the high incidence of cancer. Cancer also increases people’s psychological burden and causes a series of psychological changes, which leads to low immune function. This will accelerate cancer. As mentioned earlier, psychological treatment plays an important role in the occurrence, development and regression of cancer, which shows the importance of psychological treatment. Fourth: I think it should be put in the first place, because cancer is prone to some misconceptions, anxiety, fear, depression and other bad emotions. Therefore, psychotherapy can change people’s misconceptions about cancer, correct bad emotions and change treatment attitudes, so that patients can face correctly and actively cooperate with treatment, thus improving the efficacy of treatment. Psychological treatment methods: Through supportive psychotherapy, cognitive psychotherapy and behavioral therapy, patients can change their misconceptions, correct their bad emotions, rebuild a healthy lifestyle and improve their quality of life.