Always suspecting oneself to have cancer is clinically a kind of phobia called cancerophobia, which is the psychology of extreme fear of cancer. This psychological development is often related to the patient’s life events, such as the death of an important person due to cancer patients leave a deeper impression, and when their bodies show the same symptoms as their dead relatives, they start to become sensitive and suspicious or even suspect that they have such a disease, repeatedly check Repeated amplification, various explanations but patients cannot believe it. In clinical practice, once cancer-phobia appears, it is necessary to find a doctor whom the patient trusts especially to make careful inquiries, give supportive psychotherapy, and help the patient recognize the gap between cancer and his or her current physical condition from the cognitive perspective under the guidance of the doctor, so as to help the patient come out from cancer-phobia. Patients with serious plant nerve dysfunction, which affects work, study, life, family and social life, medication can also play a very important role, such as anti-anxiety drugs and antidepressants, anti-anxiety drugs such as benzodiazepine anti-anxiety drugs and antidepressants such as 5-hydroxytryptamine reuptake inhibitors, etc. Standardized systemic treatment can play a good therapeutic effect.