The symptoms of breast enlargement are not present, but there is pain when pressing the breasts, mainly due to: 1. The pain may occur during the non-menstrual and non-pregnancy periods, and may be aggravated during the menstrual period or pregnancy. 3. Mastitis, if a breast pain occurs during lactation, but there is no increase in milk, it may be related to inflammation of the breast tissue during lactation, which requires further examination and diagnosis.