The specific causes of breast cancer are not yet clear, but there are some factors that may have some connection with the development of breast cancer, such as hereditary factors, over-nutrition and environmental factors.
1. Genetic factors: There is a clearer relationship between genetic factors and the occurrence of breast cancer. Compared with women with no family history of breast cancer, women whose mothers or sisters have breast cancer patients will have two to three times higher chances of developing breast cancer.
2. Over-nutrition: Over-nutrition or obesity may increase the risk of breast cancer. When body fat is accumulated, the aromatase enzyme contained in fat will convert androgens into estrogen, and the increase of estrogen will increase the risk of breast cancer.
3. Environmental factors: Some environmental factors are also related to the development of breast cancer to a certain extent, but the correlation is weak, such as low-frequency magnetic fields, ionizing radiation, chlorine and so on.