Breast pain before menstruation this month suddenly no pain is generally a normal physiological phenomenon, do not worry too much, but does not rule out breast hyperplasia and other diseases caused by. 1. Physiological phenomenon: women in the menstrual period, the body estrogen level will gradually rise, when the hormone level reaches a certain height, will stimulate the mammary glands, which leads to the phenomenon of women appearing menstruation breast swelling and pain. If the phenomenon of pain during menstruation occurs before, when the phenomenon does not hurt, it is generally a normal physiological phenomenon, do not worry too much. 2. Breast Hyperplasia: It may be caused by various factors such as endocrine dysfunction, irregular diet, etc. Hormone levels will change during menstruation, which may stimulate the breasts and lead to menstrual pain. If the breasts are swollen and painful during menstruation but not now, it may be due to the improvement of the condition, so don’t worry too much and just observe regularly. When women experience breast pain during menstruation in their daily life, they can apply hot compresses to relieve the symptoms.