The degree of breast augmentation is related to genetic factors, the degree of fat accumulation in the body, hormone levels, and nutritional status. Breasts are composed of mammary tissue, adipose tissue and connective tissue, so hormone levels and the degree of obesity are important factors in the degree of breast augmentation. 1. Genetic factors: the size of female breasts has a certain relationship with heredity, and genetic factors affect the size of breasts to a certain extent. 2. Degree of fat accumulation: when the body fat content of a woman is high, the fat tissue of the breast will also increase, so visually the volume of the breast will also increase. 3. Nutritional status: In the process of breast development between the ages of 10 and 18, if there is a lack of nutrition, growth and development will be affected, and so will the size of the breasts. 4. Hormone level: Changes in the level of estrogen and progesterone in the body will also cause changes in the size of the breasts: the level of estrogen and progesterone in the body increases during puberty, pregnancy, and lactation, and the breasts will increase accordingly; the level of estrogen and progesterone in menopausal women decreases, and the breasts will become relatively smaller.