1. Abortion too: normal spontaneous abortion does not increase the risk of breast cancer, but repeated abortions, or 18-year-old abortion many times before, who easily lead to breast disease, increase the risk of breast cancer risk.
2. Menstrual factors: age of menarche as early as 12 years of age, the risk of breast cancer occurred more than 17 years of age at menarche were 2.2 times as large; menopause later than 50 years of age, more than 45 years of age who suffer from breast cancer after menopause increase the risk of a times.
3. Sex hormone disorder: estrogen (especially estradiol). Prolactin in animal experiments have confirmed carcinogenic effects. Breast cancer occurs mainly in women, and good fat in pre-menopausal. And after menarche early. Postmenopausal women in the evening. When both sides of the ovary does not develop or have made surgical resection, the incidence of breast cancer has declined markedly. In addition, metabolic disorders and cortical hormone and exogenous estrogen there is a certain relationship.
4. Unhealthy living habits: to smoke. Alcoholism is “fashionable.” Go to nightclubs. Dance halls all night long, being immersed in the feasting. Hi all kinds of cakes to eat fried food and sweets, while for coarse grains. Vegetables but never James I; single. or get married after a 30-year-old fertility, birth of a child unwilling to breast-feeding; also some women wear a bra too tight or too loose, lost the role to protect the breast.
5. Genetic factors: family history of breast cancer for women, the incidence relative risk in premenopausal and postmenopausal women were 2.4 and 1.7 (normal for women 1). In particular, relatives of the mother and sister took place in pre-menopausal women with bilateral breast cancer, his or her risk of breast cancer before the age of 40 chance of greatly increased.
6. Carcinogenic virus has been confirmed in animal experiments, but people inside and breast milk are also seen B-type virus-like particles, but also some negative attitude, So far, no sufficient epidemiological evidence to confirm the.
7. Depressed mood: In the single woman. Garrison Woman. Hostess. Retired workers and a number of secondary school teachers in the higher risk of breast disease, breast cancer incidence was also high. Because these women can easily produce anxiety. Lonely depression. Sad sad. Boring disappointment. Irritable angry and so depressed mood, long-standing negative emotional stimulation, body rhythms of life disorders, neuro-endocrine system dysfunction, which led to an imbalance within the environment, the immune power drops, can generate and release of the thymus of thymosin decrease in lymphocytes. macrophages in vivo monitoring of mutant cells in phagocytic capacity and reduced capacity are prone to cancer.
