1, breast maintenance should start from the period of youth development, especially the nipple depression, should often do pulling the nipple action. 2, happy mood: the occurrence of breast enlargement disease can not be separated from the word “gas”, excessive tension, excessive stress, worry, sadness, anger, etc. are the causes of the disease. 3, scientific diet: to prevent obesity, eat less fried food, animal fat, sweets and too much tonic food. Eat more vegetables, fruits, coarse grains (black soybean is best), walnuts, black sesame, black fungus, mushrooms, fish, lean meat, dairy products. Avoid the intake of estrogen. Such as birth control pills and cosmetics containing estrogen, do not eat chicken and beef fed with estrogen. Staple foods include wheat (flour), corn, soybeans, milk products and some mixed grains. Vegetable foods since garlic, onions, asparagus, pumpkin, cucumber, bitter melon, loofah, tomatoes, cauliflower, lettuce, carrots, radish and some vegetables. Fish especially snapper loach and yellowtail, scallops, oysters, sea cucumbers, octopus, squid and seafood such as kelp, stone cauliflower, sea tarragon. Do not eat too much sweet food, because long-term consumption of high sugar will increase the insulin content in blood, which is helpful to the growth of breast cancer cells. 4.Appropriate exercise: take 20 deep breaths in the early morning or at night every day, which can make your chest get exercise. Have a regular life, combine work and rest, and keep a harmonious sex life. Get enough sleep: sleeping on your back is the best position to avoid squeezing your breasts. Turn off the lights when you sleep. Medical researchers have confirmed that sleeping with the lights on will inhibit the secretion of a substance called melatonin in the human body, so that the body’s immune function is reduced. The incidence of cancer is twice as high as normal among night shift workers such as flight attendants, telecommunication, doctors, nurses and other night shift workers. Medical doctors warn that sleeping with lights on not only affects human immunity, but also predisposes to cancer. 5.Appropriate bra: With a soft texture and suitable size of bra, so that the breast is well fixed and supported. Emphasize that the bra should not be too tight. Most of the blood circulation of the mammary glands is on the outside of the breast, and excessive squeezing can easily induce breast diseases. Bras should be removed to sleep at night. Women who wear bras for more than 12 hours a day are more than 20 times more likely to develop breast cancer than those who wear bras for a short time or not at all. Some breast eczema is associated with bras.