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The perineum is the muscle and tissue near the anus. It is the area between either the anus and the vagina or the anus and the

The pericardium is a membrane like a sac that surrounds the heart and its major blood vessels. Normally there is a small amount of

Pericarditis is inflammation of the sac that surrounds and protects the heart (pericardium). Pericarditis can cause an abnormal

Pericardial effusion is a buildup of fluid in the space between the heart and the sac around the heart (pericardium). The extra

Perforating veins are blood vessels in the legs that connect the superficial leg veins just under the skin to the deep leg veins

A peptic ulcer is a sore in the lining of your stomach or upper small intestine. Ulcers form when the protective layer in the

Pelvic inflammatory disease (PID) is an infection of the uterus, fallopian tubes, or ovaries. If it isn't treated, PID can cause

A pelvic exam is done to check the pelvic organs. It lets a doctor see the vagina and cervix and check the size and position of

Peritonitis is an infection of the lining of the abdominal wall (peritoneum) caused by bacteria or irritating substances

A placebo effect happens when a person reports a positive health outcome from a drug or treatment that is not expected to have any