Core exercises
Learning Center
Lumbar puncture (spinal tap)
Learn about lumbar puncture, which removes a sample of cerebrospinal fluid to find infections, bleeding and other conditions. It also is called a spinal tap.
Lumpectomy
Learn what to expect from this breast-conserving surgical procedure.
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.
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.
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.
Medical abortion
Learn what to expect when medicine is used to end a pregnancy, including side effects, risks and possible complications.
Meditation
Find out more about this mind-body practice and its possible health benefits.
Minimally invasive heart surgery
Learn more about this surgery that uses small incisions in the chest as an option to open-heart surgery.
Minipill (progestin-only birth control pill)
This oral contraceptive, sometimes called the minipill, contains only the hormone progestin and no estrogen.
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.
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