Fitness basics
Learning Center
Mitral valve repair and mitral valve replacement
If you have a leaky or stiff mitral valve, you may need heart surgery. Learn about the different procedures used to repair or replace this valve.
Minipill (progestin-only birth control pill)
This oral contraceptive, sometimes called the minipill, contains only the hormone progestin and no estrogen.
Meditation
Find out more about this mind-body practice and its possible health benefits.
Medical abortion
Learn what to expect when medicine is used to end a pregnancy, including side effects, risks and possible complications.
Mastectomy
Learn about this operation to remove the breast tissue from one or both breasts. Find out about risks, results and what you can expect.
Mammogram
Learn what to expect during a breast X-ray exam. Find out about the benefits of mammograms for breast cancer screening, as well as potential risks.
Lung volume reduction surgery
Lung volume reduction surgery helps some people with severe emphysema breathe easier. Diseased lung tissue is removed so the remaining tissue works better.
Lung transplant
Learn what's involved in this major surgery that replaces a diseased or failing lung with a healthy lung, and what you can expect after the procedure.
Lumpectomy
Learn what to expect from this breast-conserving surgical procedure.
Living-donor transplant
This surgery uses a living donor's organ, such as a kidney or portion of a liver, to replace another person's organ that no longer works properly.
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