“A smile, ten years less; a sad, white head”, it can be seen that emotional changes for human health is extremely important. If a person is in a bad mood for a long time, he or she will become depressed and become sick. Although it will not necessarily lead to cancer, it will play a role in contributing to the occurrence of cancer. Joy, anger, sadness and happiness are normal emotional changes, but if they are not well controlled and kept in a bad mood, they will easily become diseases. Especially is angry, is self-suppression, bad mood. Such bad personality and emotion are risk factors in the process of cancer initiation and development. The reasons are as follows: 1. According to the theory of Chinese medicine, the human body has the saying of qi knot and qi stagnation. Anger will easily make the original seven meridians and eight channels become sluggish, and the blood flow back to the heart will become slower, which will easily generate lesions in a certain area, thus laying a hidden danger for the occurrence of diseases. Therefore, it can be said that anger is not only easy to cause cancer, that is to say, anger is the source of all diseases, but also true to its name. 2. Anger will greatly weaken the immune function of human body, leading to dysfunction of internal organs, endocrine imbalance and immune function disorder, which will lead to qi stagnation, blood stasis, phlegm coagulation and toxicity, which will eventually lead to internal deficiency of positive qi, and evil toxins will take advantage of the deficiency to form cancer tumors. Therefore, in order to prevent the occurrence of cancer, we need to maintain good emotions and be less angry in daily life; if you encounter something that makes you angry or depressed in life, you should learn to discharge and release it in time. You can go to the wilderness to cry; you can also go outdoors to do a strenuous exercise; you can also go to the concert hall to sing loudly; and finally, you can also find a professional to confide in. Also try to learn to treat people with generosity, learn to tolerate, tolerance, which is not only for people, but also for their own benefit.