For some women, symptoms such as periodic swelling and pain in the breasts around the time of their period are worse, and the normal physiological structure of the breast is disturbed and lumps appear, which may be mastocytosis coming to trouble. The cause of mastocytosis is not very clear, and it is now widely believed that the disease is caused by a combination of multiple factors. If a woman’s endocrine system is not stress-resistant and is affected by environmental, dietary, and emotional factors, she may secrete too much estrogen or less progesterone, or her mammary glands may be too sensitive to estrogen, and high absolute or relative estrogen levels may break the normal hyperplasia-rejuvenation cycle of the mammary glands, causing them to start to grow and rejuvenate poorly, eventually becoming mastocytosis. When estrogen levels that should be lowered remain relatively high before your period reports, it can cause the breast glands to overgrow. Water and sodium are retained in the breast tissue, and although the breasts become larger, they also swell and hurt more. Although this pain is so unbearable, breast enlargement is by no means a precancerous lesion of breast cancer, so there is no need to overly panic. In addition to regular medical checkups and screening, breast cancer prevention should start with eliminating susceptibility factors in daily life. In addition to genetic factors that cannot be controlled, it is advisable for women to get married and have children at an appropriate age and to breastfeed after delivery; to reduce exposure to and use of estrogen-related drugs or products (including health products and cosmetics); to avoid unhealthy “high-calorie, high-fat” diets; to refrain from smoking and alcohol abuse; to exercise in moderation; to avoid being sedentary; to control body weight; and to prevent breast cancer. Avoid being sedentary; control your weight; maintain a good state of mind and avoid mental depression and excessive stress.