Breast cancer is one of the most prevalent cancer diseases in China. Through long-term clinical and experimental research on breast cancer, it is concluded that only 3% to 5% of all breast cancer patients belong to genetic factors, and the main reason for the higher incidence of breast cancer is lifestyle. According to research, women who are relatively obese and drink alcohol regularly have the highest chance of developing breast cancer, and women who have early menarche, late pregnancy and childbirth, and women who have been menopausal for more than 5 years are also prone to breast cancer. Women who are overly obese have the highest risk of breast cancer, especially if they gain weight during menopause. This is because fat in the body forms the hormone estrone, which can cause breast cancer. The main cause of obesity is the structure of the diet. Professor Wu found that in Japan, where the consumption of fish and fishery products is the main source of breast cancer, the rate of breast cancer is 40% to 50% less than that in China. In China, meat is an indispensable part of the meal. The age of the first menstruation of women also has a certain influence on the occurrence of breast cancer. The age of first menstruation for girls has now dropped from 16 years old to 13 years old. This is due to the relatively early production of estrone in their bodies, which affects the breasts for a long time and increases the possibility of developing breast cancer. There is a clear difference between the rate of breast cancer among women in our country before and now, because women in our country used to have children earlier in general and had an average of 3 to 5 children. Scientific experiments have shown that women who gave birth early and breastfed for a long time were less likely to develop the disease. Women usually take drugs containing large amounts of estrone during menopause because it addresses symptoms such as night sweats, heart weakness and insomnia in menopausal women. However, the likelihood of developing breast cancer is greatly increased if these drugs are taken for more than five years. In addition, in a survey of tens of thousands of breast cancer patients, it was found that more women who drink alcohol regularly have breast cancer, and a glass of wine or a glass of beer a day can be a trigger for breast cancer.