Detailed information on lactose intolerance, including a list of foods that contain lactose.

Breast development happens in certain stages during a woman's life: first before birth, and again at puberty and later during the childbearing years. Changes also happen to the breasts during menstruation and when a woman reaches menopause.

The 2 most common types of benign breast lumps are cysts and fibroadenomas. A cyst is a fluid-filled sac that develops in the breast tissue. Fibroadenomas are solid, smooth, firm, benign lumps that are most commonly found in women in their late teens and early 20s.

The most common type of breast infection is lactational mastitis. This happens when a woman is breastfeeding. The nipples become cracked and sore, allowing bacteria from the baby's mouth to enter the ducts and rapidly multiply in the milk.

Timing your mammogram when your breasts are not tender is important. In premenopausal women, this is usually 1 week after a menstrual period.

It is important to remember that a lump or other changes in the breast, or an abnormal area on a mammogram, may be caused by cancer or by other, less serious problems.

To diagnose a breast condition, your healthcare provider will examine your breasts and may order imaging tests or a biopsy.

Cancer clinical trials are studies managed by government agencies, educational institutions, private not-for-profit organizations, or commercial businesses. They develop and evaluate the effectiveness of new treatments and therapies for diseases.

Your breasts change at different stages of your life. Breast self-awareness is knowing how your breasts normally look and feel. This can help you to find even small changes right away.

Detailed information on the most common breast conditions, including mastalgia (breast pain), benign breast lumps, fibrocystic breast changes, nipple problems, nipple discharge, breast infections, and breast inflammation