The main causes of breast pain to touch include the following aspects: First, it may be a reaction caused by the more common breast enlargement, the pain to touch before the onset of menstruation will be significantly worse, after the onset of menstruation the pain to touch can be naturally relieved, to the hospital for ultrasound examination can basically determine the diagnosis. Secondly, it may be a reaction to an inflammatory disease of the breast. Different periods of inflammatory diseases of the breast may have different names, lactation is called lactation mastitis, non-lactation may be plasma cell mastitis, chronic lymphocytic mastitis. Third, it may be caused by skin diseases in the breast area, the most common being localized herpes zoster, which can be very painful to the touch. Fourthly, it may be caused by the effects of pregnancy, the breast will be very sensitive after pregnancy. Fifth, it may occur after a violent sexual activity.