Breast tenderness or pain can result from many different factors; however, physicians stress that tenderness or pain does not commonly indicate breast cancer and that some breast tenderness is normal, according to the University of Maryland Medical Center.

Men have far less breast tissue than women and consequently have a lower incidence of breast-related ailments. However, men can experience swelling, pain and cancer in their breasts. More common than breast cancer in men is swelling in one or both breasts.

Antibodies, also known as immunoglobulins (Ig) are a form of protein. The body produces antibodies when antigens, which are substances that can cause damage are present. Parasites, bacteria, cancer cells and viruses are examples of antigens.

Lifting weights comes with myriad benefits. Chief among them is strength, but resistance training also can improve balance, enhance mood, increase caloric need and even prevent bone loss. That being said, lifting weights has its own set of safety concerns.

Each breast contains tissue rich in nerve endings, each of which send feedback to the brain in response to changes in temperature, pain or touch. Tingling in the breast can occur when nerves in the breast become damaged, leading to a "pins and needles" feeling that can eventually lead to numbness.

Breast cancers are assigned to 1 of 4 stages at the time of initial diagnosis and treatment. Stage is determined by the size of the cancer and whether it has spread to lymph nodes under the arm or to more distant parts of the body.

When girls hit puberty, estrogen is released into the body and the breasts begin to grow. This tends to coincide with the beginning of menstruation. As the breasts grow, the milk ducts in them increase in size, causing the breasts to expand at the nipple. Then the breast tissue itself expands. According to TeenGrowth.

Each breast contains an extensive system of glandular tissue, surrounded by fatty tissue, blood vessels, lymph nodes, connective tissue and nerves. Diseases affecting the breast can cause inflammation, breast irritation and tissue damage.

A swollen breast is a common condition that occurs in babies, both male and female. One or both of a baby's breasts may become swollen, firm and lumpy within a week after birth. Although this condition may seem peculiar, the swollen breasts usually shrink within a few weeks or months of life.

Each year, approximately one in every ten women is diagnosed with breast cancer, according to MedlinePlus. This form of cancer arises when abnormal, cancerous cells rapidly replicate within the breast tissue.

Each breast contains a series of milk ducts, which make up a part of breast glandular tissue. These tubes run from the milk-producing breast lobules to the nipple, allowing for lactation and breastfeeding.

Many cases of breast cancer are estrogen-responsive, which means the tumor grows in response to estrogen. Tamoxifen is a therapeutic agent designed to block the effects of estrogen.