Located almost in the center of the chest, the adult human heart is about the size of a fist.

Rhinitis is when a reaction occurs that causes a stuffy nose, runny nose, sneezing, and itching. Most types of rhinitis are caused by inflammation. Here's what you need to know.

Symptoms of latex allergy include watery or itchy eyes, wheezing, hives, flushing or a skin rash, itching, or swelling.

Breast cancer in men is rare—less than 1% of all breast cancer occurs in men.

Detailed information on mammograms, including the different types, how a mammogram is done, and recommended screening guidelines.

Whenever the normal drainage pattern in the lymph nodes is disturbed or damaged - often during surgery to remove the lymph nodes - the arm may swell. This swelling, caused by too much fluid, is called lymphedema.

Detailed information on breast health, anatomy of the breast, breast development, breast cancer prevention, common breast conditions, and breast cancer in males and females

Osteosarcoma often affects the long bones around the knee. It happens most often in children, teens, and young adults.

Osteogenesis imperfecta (OI) is an inherited (genetic) bone disorder that is present at birth. It is also known as brittle bone disease. A child born with OI may have soft bones that break (fracture) easily, bones that are not formed normally, and other problems. Signs and symptoms may range from mild to severe.

Talking with healthcare providers about your cancer can be overwhelming. Read on for a helpful list of questions that you can bring to your appointments.