Breast pain can be caused by various factors, including hormonal fluctuations, medication side effects, breastfeeding, and chest wall pain. However, the most common type of breast pain is linked to the menstrual cycle, and it is nearly always hormonal. Estrogen and progesterone are the hormones responsible for causing breast pain, and they can lead to swelling and tenderness in the breasts. Breast pain can occur in one or both breasts and can be felt as a dull, continuous ache or a sharp, shooting pain. It can also be felt as a radiating feeling in the underarm area. Breast pain can increase or change its pattern with the hormone changes that happen during times of stress. It is important to note that breast pain can be a sign of a more serious condition, and it is essential to see a doctor if the pain is severe or persistent.