1. Incidence of breast cancer: Among the many diseases that attack the breast, breast cancer has become a common and frequent disease that seriously threatens women’s physical and mental health and even jeopardizes their lives. Data proves that the incidence rate of breast cancer in the world is increasing by 0.2%-3% per year. The incidence rate of breast cancer in Wuxi is about three in ten thousand. At present, the absolute number of people who have lost their breasts or lives to breast cancer is rising every year. Fortunately, with the popularization and improvement of people’s knowledge of cancer prevention, the progress of medical science and the improvement of medical equipment, the prevention and treatment of many kinds of breast diseases, especially breast cancer, have achieved remarkable results. 2. Pathogenic factors of breast cancer: small age of menarche is an important risk factor of breast cancer, the risk of breast cancer is 4 times different between those who have menarche before the age of 12 and after the age of 13, and the risk of breast cancer can be relatively reduced by 20% for each year of delay of menarche; secondly, large age of menopause is also a risk factor of breast cancer, the possibility of breast cancer before menopause before 45 years old is 30% lower than that of menopause between the ages of 50-55 years old; alternatively, long time of menopause is also a risk factor of breast cancer. Longer duration of menstruation is also a risk factor, as well as other factors such as celibacy, late marriage and older age at first birth. Being prolific and breastfeeding are conducive to reducing the risk of breast cancer. Estrogen is an important stimulus for the development of breast cancer, and progesterone is a protective factor. The incidence rate of breast cancer is closely related to the level of economic development or the degree of industrialization: Breast cancer has long been the top of female malignant tumors in developed countries such as Europe and America, and its incidence rate is much higher than that in economically backward Asian, African and Latin American countries. Reasons: Social progress has brought about improved nutrition, which can advance the age of menarche. A high-fat diet is itself a risk factor for breast cancer. Obesity. Certain benign breast diseases are also risk factors. Finally, the development of society has led to a high degree of pursuit of quality of life and a significant increase in the proportion of replacement hormones in postmenopausal women. 4, the development of breast cancer has obvious family aggregation: there are many cases of sporadic cases, and a considerable part of the patients can not find obvious causative factors, therefore, in the rising incidence of breast cancer today, we suggest that friends with causative factors actively participate in the census and monitoring, and also to remind other friends of the breast cancer should not be taken lightly. Breast Hyperplasia: Also called cystic breast hyperplasia, it is a benign disease that is neither inflammation nor tumor. It is a disorder of the body’s endocrine environment caused by breast parenchyma and mesenchymal hyperplasia and dysfunction. The most typical manifestation of this disease is cyclic changes in breast nodules and pain, often gradually aggravated before the onset of menstruation, and gradually reduced or disappeared after menstruation. Most often bilateral onset, sing one side is more severe. The nodules are usually multiple, cord-like or lamellar, and can be scattered or confluent, with varying texture, soft or tough, generally smooth, and the boundary with normal tissue is difficult to determine. They are often painful to touch to varying degrees. Occasionally, the nodules may be less obvious, with only a thickened area of breast tenderness. In rare cases, the hyperplastic nodule can be isolated and become a more specific lump, which can also be harder in texture, but does not adhere to the skin and usually does not appear to be a significant localized bulge. At this point the hyperplasia is difficult to distinguish from breast cancer. The severity of pain in hyperplasia can be completely inconsistent with the presence and extent of the nodule, or even the opposite. In addition, the pain of hyperplasia can involve the shoulders and back. Hyperplasia can also present with nipple discharge, which is usually straw yellow or brown in color. Although the disease is most common in middle-aged women, it can occur in adolescents and post-menopausal elderly people. Patients with hyperplasia often have triggers such as mood swings and exertion prior to the consultation, suggesting that mental stimulation and an irrational lifestyle may be important factors aggravating the condition. Surgical biopsy is often required if it is difficult to distinguish from breast cancer. Generally speaking, the purpose of surgery is only to confirm the diagnosis, but not to eradicate the disease, so nodules and pain can still occur after surgery. In rare cases (e.g., when symptoms are so severe that they interfere with life and work, or when there is a clear family history of breast cancer and a high risk of developing the disease), total mastectomy with breast reconstruction may be considered. It is generally believed that the disease is associated with endocrine abnormalities, so women with hyperplasia have a higher chance of getting breast cancer than women without hyperplasia. Women with hyperplasia should go to the hospital for regular checkups along with breast self-examination.