Women with dense, firm breasts are more likely to develop breast cancer. In addition, abnormally large breasts during adolescence, too much fondling of breasts when they are underage, or filling the breasts with inappropriate substances for breast reconstruction in order to keep the breasts plump and beautiful, are also one of the causes of breast cancer. 2.Special body shape Women who are particularly obese above the waist, with a waist circumference similar to the hips, or who are very thin before menopause. 3.Mental trauma According to the survey, introversion and unhappy early life are important factors leading to cancer. 4.Diet preference Research shows that high fat and low fiber diet can increase the incidence of breast cancer by more than 4 times. A young woman who drinks alcohol three to six times a week, each time calculated by 250 ml of beer or 185 ml of spirits, will increase her risk of breast cancer by 30% to 60% in the future. According to research, the risk of breast cancer for women who are not breastfeeding is more than 1.5 times greater than that for breastfeeding women. According to the data, the risk of breast cancer for women who have never given birth is 30% higher than that for women who have given birth; the relative risk of breast cancer for women over 35 years of age who have had their first pregnancy is 3-4 times higher than that for women under 30 years of age who have had their first pregnancy. 8. Family history of cancer According to the data, the family history of cancer, especially the parents and sisters who have been breast cancer patients, are about 30% more likely to develop breast cancer than others. According to research, cystic hyperplasia, simple hyperplasia and fibroids of the breast may deteriorate into cancer.