The causes of too small breasts in women may be related to genetic factors, pituitary gland diseases, excessive weight loss, malnutrition during puberty, primary ovarian insufficiency and other conditions. 1. Genetic factors: too small breasts have a certain genetic predisposition, if women in the family have smaller breasts, it may also lead to women’s breasts shriveled. 2. Pituitary disease: If the patient has hypopituitarism, anterior pituitary hypopituitarism and other diseases, it may lead to a decrease in the level of hormones in the blood, making the breasts smaller. 3. Excessive weight loss: If a woman loses weight excessively, it may lead to a decrease in the fat content of the breasts, resulting in smaller breasts. 4. Malnutrition during puberty: During the pubertal development stage, insufficient nutritional intake due to diet and other reasons affects the normal development of the glands and the accumulation of fat. 5. Primary Ovarian Hypoplasia: This is a congenital disease that affects the normal development of breasts due to the reduction of sex hormone and growth hormone, resulting in smaller breasts. If your breasts are too small, you can go to the Breast Surgery Department in time to clarify the cause of the disease and follow the doctor’s instructions to carry out the appropriate conditioning treatment.