The causes of breast cancer are not yet fully understood, but it is worth noting that scientists have concluded that there are eight major risk factors that trigger breast cancer: 1. The incidence of breast cancer in this kind of family is 2-3 times higher than that in families without family history, and this kind of breast cancer mostly occurs after menopause and is often unilateral. The risk of breast cancer is 2.2 times higher for those who have their first menstruation earlier than 12 years old than those who have their first menstruation at 17 years old; the risk of breast cancer is 1 times higher for those who have their first menstruation later than 50 years old than those who have their first menstruation after 45 years old. 3. Too many abortions: Normal natural abortion does not increase the risk of breast cancer, but repeated abortions or multiple abortions before the age of 18 can easily cause breast diseases and increase the risk of breast cancer. Reminder: multiple abortions are prone to cervical cancer. 4. Breastfeeding: Breastfeeding is one of the best natural means to prevent breast cancer. The longer you breastfeed, the less risk of breast cancer. 5. Poor quality of sex life: Breast diseases and sex life are closely related, and women’s sexual repression can increase the incidence of lobular hyperplasia and breast tumors. Domestic survey shows that 86% of women with lobular hyperplasia have never reached orgasm during sex; the older the age of first marriage, the higher the incidence of breast cancer. 6. Depression: Among single women, ladies left behind, PR girls, retired female workers and some secondary school teachers, more suffer from breast diseases and have a high incidence of breast cancer. As these women are prone to depression, such as tension and anxiety, loneliness and depression, sadness and sorrow, bitterness and disappointment, impatience and irritation, the body’s life rhythm will be disturbed and the neuroendocrine system will be dysfunctional, which will lead to the imbalance of the internal environment and the decrease of immunity, so that the thymus gland will produce and release less thymosin, and the lymphocytes and macrophages will be less able to monitor and phagocytose mutated cells in the body. The ability of lymphocytes and macrophages to monitor and phagocytosis of mutated cells in the body is reduced and cancer is likely to occur. 7. Excessive obesity: obesity is closely related to breast cancer. Girls who are obese are prone to early sexual maturity, which will lay the foundation for breast cancer in the future. The incidence of breast cancer in obese people is 3.45 times higher than that of non-obese people because of the excessive accumulation of fat, the production of estrogen increases, and the excess estrogen is lipidated and stored in the adipose tissue, and constantly released into the bloodstream, which stimulates the breast tissue and, over time, easily causes breast cancer. In addition, most obese people have hypercholesterolemia and hyperinsulinemia. After the cholesterol in the body is raised, the cholesterol content of cell membranes of lymphocytes and macrophages is increased, which inhibits the immune function. 8, bad habits: to smoke, alcohol as “fashionable”, to nightclubs, dance halls, all-night immersion in the lights, like to eat fried food and a variety of pastry sweets, but never to rough food, vegetables; celibacy, or after 30 years of age before marriage and childbirth, the child does not want to breastfeed; also some women wear bras Too tight or too loose, losing the role of breast protection.