At present, it is believed that the cause of breast cancer is related to the following factors:
(1) the level of estrogen is high, and breast cancer is common in those with high level of estrogen, such as women with early menarche and late menopause. People with low levels of estrogen (such as low ovarian function) rarely develop breast cancer. Long-term use of hormone replacement therapy and excessive intake of fat and protein in postmenopausal patients can also increase the level of estrogen and increase the risk of breast cancer.
(2) the risk of breast cancer among family members with family history and family history of breast cancer was 2 to 3 times higher than that of the general population, and the incidence of breast cancer among mothers or sisters was higher. and it has the characteristics of early age of onset, bilateral breast cancer and other cancers.(3) Bad lifestyle, Asian-Americans with a relatively low risk of breast cancer have increased their risk of breast cancer by 80% 10 years after they moved to the United States. Many scholars believe that the western lifestyle and diet will increase the risk of breast cancer, and the influence of environmental factors is greater than that of genetic factors.(4) for other factors, the incidence of the disease usually reached the peak in women aged 45 to 64, and the incidence decreased gradually after the age of 65. Unmarried, infertile or postpartum women over the age of 40 who do not breast-feed themselves and women whose breasts have been abnormally exposed to radiation or who drink alcohol regularly have an increased risk of breast cancer.As the cause of breast cancer is not completely clear, it is difficult to propose exact preventive measures. However, according to the factors known to be related to the incidence of breast cancer, it is possible to reduce the incidence of breast cancer by changing daily habits.First, it is necessary to establish a good lifestyle. Eat less high-fat and high-protein diet. at present, it has been found that excessive intake of human fat and animal protein during puberty and prepuberty will lead to excessive accumulation of body fat, early menarche, and may increase the risk of breast cancer. Try not to drink alcohol. A large-scale survey conducted by a research team led by Judi Zhengwu, a professor at Aichi Medical University in Japan, shows that women who consume more than 15 grams of alcohol a day have a three-fold higher risk of breast cancer than non-drinkers. Eat more fresh fruits and vegetables, beans and bean products. Exercise regularly to avoid obesity.Second, encourage postpartum breastfeeding. Medical experts at the University of Oxford in the UK have found that breastfeeding can not only ensure that babies get comprehensive nutrition, but also effectively reduce the risk of breast cancer in mothers. To study the relationship between breastfeeding and breast cancer, experts from the University of Oxford surveyed more than 140000 women in more than 40 countries. The survey shows that for every extra child a woman gives birth to, her risk of breast cancer will be reduced by 7%, and the risk of breast cancer will be reduced by 4.3% if breastfeeding is extended by one year. Because during breastfeeding, most women stop ovulating and the normal ovulation cycle is disrupted, which can reduce the possibility of breast cancer.
