Chest pain or breast pain or breast swelling are very common symptoms of breast. The cause of it may be related to the action of estrogen and progesterone secreted by the ovaries on the glands of the mammary glands, and the hormonally affected mammary glands will undergo congestion, edema, proliferation of the ductal epithelium, and thickening of the interstitium. Part of the people due to stubborn tissue proliferation, will cause macroscopic gland thickening, hardening, the sensory nerves running through the glands will be compressed and pulled, part of the sensitive people will feel the breast stinging pain, hidden pain, radiating pain and so on. Usually in the early stage, this pain will appear in the 7-10 days before menstruation, after menstruation this pain will be weakened until disappeared, but if the breast hyperplasia is more serious, this pain will be gradually prolonged, and become irregular.