Breast in medical terms refers to the female breast. Under normal physical conditions, the main difference between hard and soft breasts is the amount of glandular content inside the breasts, and also soft and hard breasts may be a response to different diseases. In the healthy female population, young women’s breasts are denser and harder, and look firmer from the outside. The glands in the breasts of middle-aged and elderly women are in a state of slow degeneration and atrophy, with only some or a small portion remaining, and the main component of the breasts is only fat, so they appear to be softer, lax or even sagging. Women’s breasts are unusually soft and have a sense of fluctuation, which may be caused by certain diseases with more liquid components of the breast, such as breast cysts. Local breasts are harder, may be a tumor or breast lumps, etc.. Therefore, once the body abnormalities should be timely medical care to clarify the cause of the disease, the appropriate treatment.