Normal breast press will not have pain, breast press pain may be related to menstrual period and other physiological factors, may also be breast hyperplasia, mastitis and other diseases caused by. 1. Physiological factors: normal breast press will not be painful, in the pre-menstrual period, sometimes pain, mainly with the body hormone level changes and other factors have a relationship with the female menstruation before the increase in estrogen levels related to the phenomenon is normal. In the menstrual period to do more breast massage, can reduce breast swelling and pain. 2. Breast hyperplasia: If there is pain when pressing the breasts during the non-menstrual period, you need to be alert to the occurrence of breast hyperplasia. This is mainly related to endocrine disorders such as estrogen and progesterone imbalance. 3. Mastitis: Pain when pressing the breast may also be caused by mastitis, which is common in breastfeeding women and is mainly associated with milk stagnation, infection and other factors. The pain of pressing on the breast should also be considered for other reasons such as tumor trauma. It is recommended to pay attention to breast hygiene in daily life, reduce the stimulation of breast squeeze, and wear loose underwear. When abnormalities are found, relevant examinations should be completed in time and treatment should be carried out under the guidance of doctors.