When in puberty or normal physiological period, the body’s estrogen and progesterone secretion of the influence of the mammary glands inside the mammary ducts and soft tissue metabolism will be more exuberant, there will be a hard feeling when the breasts are touched. Breastfeeding women have more milk secretion in their bodies, and if the excess milk is not discharged from the body, the excess milk will be stagnant in the breasts, and the breasts will feel hard to touch, not very soft. If the supply of nutrients or vitamins in the body is not sufficient, and the body is usually weak, the breasts will not be able to get timely nutritional development and will be hard. If there is mastitis or hyperplasia nodules or breast fibroid tumor in the breasts, the breasts will also not be soft because of the influence of the nodules.