4 major factors causing breast cancer

Breast cancer is the most common malignant tumor in women. Its cause is still unclear, but it may be related to endocrine disorders, breast development, genetics, chronic stimulation, viruses, diet, and mental factors.

1. Women with estrogen factors such as early menarche (before the age of 12) or late menopause (after the age of 55) have a 2-fold increased risk of breast cancer. Women who have never given birth or have their first child after the age of 35 have a 3-fold increased risk of breast cancer. Oral contraceptives do not increase the chance of breast cancer, but if oral contraceptives are used for several years before the first pregnancy, they may have a certain impact on the incidence of breast cancer. There are also reports that long-term use of hormone replacement therapy after menopause can increase the risk of breast cancer.

2. Dietary factors: Women who mainly eat meat have a higher incidence rate than those who mainly eat vegetarian food. Obese women are more likely to develop breast cancer, especially after menopause.

3. Genetic factors: Very few breast cancers are hereditary. If a woman's mother or sister has had breast cancer, then the woman's chance of developing breast cancer is 2 to 3 times higher than the general population.

4. Benign breast diseases such as cystic breast hyperplasia and breast fibroids have the potential to become malignant.