The female breast is an organ that changes with puberty, with the monthly menstrual cycle,and with pregnancy. It also continues to change with age. Most women experience breast changes at some time. Your age, hormone levels, and medicines you take may cause lumps, bumps, and discharges (fluids that are not breast milk).
Breast lumps, pain, discharge or skin problems can be a sign of a minor problem or something more serious, so it's important to pay attention to any changes. Most changes in your breasts are perfectly normal and no cause for concern. But some changes need medical attention. Chief among these are breast pain and lumps.

Hormonal changes

These are changes that can cause swelling, lumpiness or tenderness of the breast. Many women experience such changes as hormone levels affect their breast tissue during their menstrual cycle.

Cysts

Cysts occur when fluid becomes trapped in the breast tissue. They are very common in women aged 35 to 50. They usually disappear with menopause.

Nipple discharge

Discharge from the nipple is quite common and is usually not a problem. Very rarely, a nipple discharge may be due to cancer or other diseases. See your doctor if you develop nipple discharge. Further tests may be needed, particularly if you have bloodstained or watery discharge, or if the discharge comes from only one breast.

Inverted nipples

Some women have a nipple or nipples that are turned in or ‘inverted'. This is normal for them. An inverted nipple can develop after you have stopped breastfeeding or while you are pregnant.