Women’s breasts are mainly composed of skin, fatty tissue, fibrous tissue and breast glands. The softness of women’s breasts is often related to the ratio of fatty tissue to other tissues in the breasts. During menstruation or around menstruation, breasts may become slightly hard due to hormonal changes, or hard or soft due to age, different living and eating habits, and diseases.1. Physiological structure: In general, the higher the percentage of fatty tissue, the softer the breasts will be to the touch, but they may be less elastic and more likely to sag. If the ratio of other tissues is high, such as more glands, the female breasts may feel firmer and have better elasticity; 2. Menstruation: Some women may experience hardening of the breasts due to changes in hormone levels during or around menstruation; 3. This is a normal physiological phenomenon; 4, life and diet habits: the softness of women’s breasts may be related to their diet and exercise habits, such as women with good nutrition and obesity, their breasts are usually softer, while women with more exercise and muscle may have firmer breasts; 5, disease: some women may suffer from mastopexy, mastitis and other diseases, resulting in hard nodes and lumps in the breasts, causing them to become hard. The breast is hardened and often accompanied by pain. It is recommended that patients go to a regular hospital for relevant examinations such as ultrasound to clarify the cause and timely targeted treatment.