Breast diseases are one of the most common diseases in women, ranging from breast hyperplasia, benign breast lumps (e.g. fibroids, nodules, cysts), breast inflammation (lactational mastitis, plasma cell mastitis) to atypical breast hyperplasia, intraductal papilloma, breast cancer, various types of breast diseases that afflict women of all ages, especially breast cancer, as one of the most common malignant tumors in women, worldwide Each year, 1.2 million women develop breast cancer and about 500,000 women die from it. The incidence of breast cancer is also increasing year by year in China, and the trend is younger, which has become one of the main killers that endanger women’s lives. So, what are the common causes of breast diseases? 1. Endocrine: Most of the breast diseases are caused by endocrine imbalance and unbalanced hormone secretion in the body. This is caused by various factors that cause high estrogen and relatively low progesterone in the body, which makes it impossible to regulate estrogen and protect the breast. Bad habits: such as staying up late, irregular work and rest, alcoholism, smoking, sitting but not moving lifestyle can cause hormonal disorder in women, which is especially likely to lead to the occurrence of breast cancer. Dietary factors: People’s diet structure has changed and they eat a lot of fat, sugar, protein, vegetables and fruits in the market, especially chicken and beef. 4, mental factors: the accelerated pace of life, mental stress. The pressure from life and work leads to mental tension, depression, irritability and irritability seriously affect endocrine. 5, marriage and childbirth factors: early maturity of women, early menarche, menstruation before the age of 12, late menopause after 50 years old, celibacy, late marriage over 30 years old, late childbirth over 35 years old, not breastfeeding, multiple abortions, abuse of contraceptives and other groups. 6, genetic factors: related to genetic factors, especially maternal direct relatives such as: mother, sister, aunt, etc. if suffering from breast disease, due to genetic genetic relationship, the disease has a high chance. 7, unscientific wearing bra: bra too tight, cups are not suitable, with steel or hard plastic ring, the pressure on the breast, blood circulation, lymph circulation is blocked, not only easy to lead to breast enlargement, breast lumps, but also lead to shoulder, neck, back pain; dizziness, chest discomfort, dysmenorrhea, etc.. 8, before and after menopause women obesity and low level of physical activity: menopause is a special period for women, prone to endocrine disruption. At the same time, women’s hormones decline, resistance will also be reduced, such as the previous mammary hyperplasia prone to malignancy, so more attention should be paid to breast health.