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Otitis Media
Otitis media is inflammation or infection in the middle ear, the space behind the eardrum. It may involve an active infection or…
Ovarian Cancer
Ovarian cancer is the uncontrolled growth of abnormal cells in or around an ovary. Several tumor types can develop from different cells…
Ovarian Cyst
An ovarian cyst is a fluid-filled sac or other growth that develops in or on an ovary. Many cysts are benign, meaning…
Paget Disease Of Bone
Paget disease of bone is a chronic disorder of bone remodeling, the normal process in which old bone is removed and new…
Palpitations
Palpitations are the feeling of being unusually aware of your heartbeat. You may notice fluttering, pounding, racing, or skipped beats. Palpitations can…
Pancreatic Cancer
Pancreatic cancer begins when abnormal cells in the pancreas grow uncontrollably and form a tumor. The pancreas is an organ behind the…
Pancreatitis
Pancreatitis is inflammation of the pancreas, an organ behind the stomach that helps digest food and regulate blood sugar. It can affect…
Panic Attacks
A panic attack is a sudden surge of intense fear or discomfort that can cause physical symptoms such as a racing heart,…
Papillary Muscle Rupture
Papillary muscle rupture is a severe injury inside the heart in which one of the muscles supporting the mitral valve tears. The…
Parathyroid Adenoma
A parathyroid adenoma is a usually noncancerous growth in one of the small parathyroid glands behind the thyroid. The growth can make…
Parkinson Disease
Parkinson disease is a progressive disorder of the nervous system. It involves the loss or impaired function of brain cells that produce…
Paroxysmal Nocturnal Hemoglobinuria
Paroxysmal Nocturnal Hemoglobinuria (PNH) is a rare acquired blood disorder in which a mutation in a bone marrow stem cell makes some…
Patent Ductus Arteriosus
Patent ductus arteriosus (PDA) is a heart condition in which a normal fetal blood vessel remains open after birth. The ductus arteriosus,…
Pediatric Appendicitis
Pediatric appendicitis is inflammation of the appendix, a small pouch attached to the large intestine. It can worsen quickly and may lead…
Pediatric Surgery
Surgical care for infants, children, and adolescents, adapted specifically for pediatric patients.
Pediatrics
Comprehensive health care for infants, children, and adolescents, from routine checkups to childhood illnesses.
Pellagra
Pellagra is a disease caused by not having enough niacin, also called vitamin B3, in the body. This pellagra definition includes deficiency…
Pelvic Organ Prolapse
Pelvic organ prolapse happens when the muscles, ligaments, and connective tissues supporting the pelvic organs become weakened or stretched. The bladder, uterus,…
Pendulous Abdomen
A pendulous abdomen, also called a pannus abdomen, is an abdominal fold that hangs downward over the lower abdomen, groin, or upper…
Peptic Ulcer
A peptic ulcer is an open sore in the protective lining of the stomach or duodenum, the first part of the small…
Pericardial Effusion
Pericardial effusion is a buildup of extra fluid in the pericardial cavity, the space between the heart and the pericardial sac that…
Pericarditis
Pericarditis is inflammation of the pericardium, the thin, two-layered sac that surrounds and protects the heart. Acute pericarditis begins suddenly and usually…
Peripheral Artery Disease
Peripheral artery disease (PAD) is a condition in which blood flow to the arms or legs is reduced, most often because fatty…
Peripheral Neuropathy
Peripheral neuropathy is damage or dysfunction affecting nerves outside the brain and spinal cord. It commonly affects the feet, legs, hands, or…
