The most common cause of breast pain
will be related to your menstrual cycle, its seen more preceding the cycles or during the cycles. Another factor could be ill fitting brassier. Wear proper size brassier.
Take analgesics(tablet to relieve pain). Try evening primrose oil. if the problem still persists then dont hesitate to consult a General Surgeon
Also kindly do mention the age and complete details.
All the best
Take good care of health