The specific causes of breast cancer are not clear at present, but the following factors are currently associated with the development of breast. 1. Genetic factors: Genetic factors are the high-risk factors for the development of breast cancer. People with a history of breast cancer in first-degree relatives (such as parents, children and siblings) have a risk of developing the disease that is two to three times higher than that of the general population. Some gene mutations will also increase the risk of breast cancer. 2. Hormonal factors: long-term use of estrogenic drugs, early age of menarche, late age of menopause, infertility, late age of the first birth, short breastfeeding time, etc. can increase or prolong the exposure of estrogen in the body, which will increase the risk of breast cancer. 3. Dietary factors: too much fat intake, too little vegetable and fruit intake, resulting in over-nutrition and obesity will increase the risk of cancer. Moreover, bad dietary habits such as smoking and drinking will also increase the risk of cancer. 4. Other factors: chest radiation treatment, poor mental state, long-term exposure to oil smoke, etc. will also increase the risk of cancer. If patients feel unwell, it is recommended to go to regular hospitals for consultation.