How is tit hair hard touch painful to return a responsibility

Hard and painful nipples may be caused by a variety of factors, such as hormonal changes, nipple inflammation, breast hyperplasia, etc.

During puberty and menstruation, breast development and mammary duct enlargement may cause hard and painful nipples due to changes in estrogen levels in the body, which is usually normal. In addition, nipple inflammation, breast hyperplasia, poor living habits (such as wearing inappropriate bras), skin diseases (such as nipple eczema, atopic dermatitis), and breast diseases (such as mastitis, breast cancer) may cause hard and painful nipples.

Note that these are just some of the possible causes. If there is pain or other discomfort, it is strongly recommended to seek medical advice so that the doctor can diagnose and treat it according to the specific situation.