The sudden onset of pain in the breast may be due to the following two clinical reasons: First, it may be due to acute inflammation of the breast, there will be local redness, swelling, pain, pain will appear jumping pain twitch-like pain, to completely diagnose the inflammation is caused, it is best to do breast ultrasound, timely detection of early inflammation, give anti-inflammatory symptomatic treatment, the effect is more ideal. Second, it may be due to hyperplasia-like disease of the breast, also known as mastopexy, the pain may suddenly appear before the menstrual cycle and is more pronounced, and can seriously affect learning, work and sleep. When the pain of breast enlargement is more severe during the menstrual period, you can consider taking oral medications such as fen-phen for pain relief.