Happy or not happy, a good state of mind, in fact, with the health of the breast is still quite close relationship. The easiest way to understand the truth is that people who have been in a bad mood, depressed, is bound to affect its immunity, and immune function can be said to be an important barrier to the body’s anti-cancer, in the normal human body, every day, there will be some malignant cells, but will be cleaned up or repaired in a timely manner, if the immune system is damaged, these “bad cells” can not be cleared out of the body, and the body has no way to control the growth of cancer cells, then it is difficult to escape the invasion of cancer. If the immune system is impaired, these “bad cells” can not be cleared out of the body, and the human body has no way to control the growth of cancer cells, then it is very difficult to escape the cancer invasion. In addition to the above factors that may induce cancer, emotional tension or psychological stress may also affect the mammary glands. Currently known research has found that breast diseases are inextricably linked to the endocrine system. Being in a high-pressure situation for a long period of time, being emotionally tense, and not getting enough rest may lead to endocrine imbalance, and under this series of influences, it is likely to have a huge adverse effect on the breasts. Of course, mental stress and depression will also lead to the emergence of breast hyperplasia, and a very small percentage of all breast hyperplasia will turn into cancer. On the contrary, even for breast cancer patients, cheerful and calm emotions also play an important role in post-surgery recovery. There was once a pair of sisters who were ill at the same time, the sister’s condition was serious and the sister’s illness was light, but the sister was optimistic about fighting cancer with the support of her family, while the sister was always angry and sad, and eventually the sister passed away before her sister. It can be seen that, in any way, happy or unhappy, is not only affect the mood of things, but also affect the breast health.