Breast rubbing may increase the size of the breasts to a certain extent. On the one hand, the process of breast rubbing can stimulate the breasts, resulting in increased secretion of estrogen causing breast parenchymal hyperplasia. On the other hand, breast rubbing can promote local blood circulation in the breast, strengthen the metabolism of the breast and promote breast development. When suffering from breast disease, breast rubbing should be done under the guidance of a specialist to avoid further aggravation of the original disease. If your breasts are too small, you can go to a regular medical institution for breast augmentation or plastic surgery. In daily life, you should mainly eat a high quality protein diet and avoid eating too much fried and spicy stimulating food.