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Migraine
Migraine is a neurological condition that can cause recurring attacks of head pain and other symptoms. The pain may be moderate to…
Multiple Myeloma
Multiple myeloma is a blood cancer that begins in plasma cells, immune cells made in the bone marrow. In this disease, abnormal…
Multiple Sclerosis
Multiple sclerosis is a chronic disease in which an abnormal immune response damages myelin and other nerve structures in the brain and…
Myasthenia Gravis
Myasthenia gravis is an autoimmune disorder that affects communication between nerves and voluntary muscles. The immune system interferes with signals that tell…
Myelodysplastic Syndromes
Myelodysplastic syndromes (MDS) are a group of blood cancers that begin in the bone marrow, where blood cells are made. Abnormal marrow…
Myelofibrosis
Myelofibrosis is a rare, chronic blood cancer in which scar tissue builds up in the bone marrow. The scarring disrupts normal blood-cell…
Myocarditis
Myocarditis is inflammation of the heart muscle. This inflammation can make it harder for the heart to pump blood and may affect…
Neck Cancer
Neck cancer is a broad term for a group of cancers that can begin in different tissues of the head and neck,…
Neonatal Lupus
Neonatal lupus is a temporary antibody-related condition that can affect some babies during pregnancy or after birth. Maternal anti-Ro/SSA or anti-La/SSB antibodies…
Nephrotoxicity
Nephrotoxicity is kidney damage caused by a medicine, chemical, or other toxic substance. Common triggers include some antibiotics, nonsteroidal anti-inflammatory drugs (NSAIDs),…
Nutritional Deficiency After Surgery
Nutritional deficiency after surgery occurs when the body does not receive, absorb, or use enough nutrients to support healing and normal function.…
Osteoarthritis
Osteoarthritis is a progressive joint disease in which cartilage and other joint tissues gradually change and become damaged. It most often affects…
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…
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…
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…
Pneumococcal Pneumonia
Pneumococcal pneumonia is a bacterial lung infection caused by Streptococcus pneumoniae, also called pneumococcus. The infection can fill or inflame the air…
Pneumonia
Pneumonia is an infection or inflammation of the tiny air sacs in one or both lungs. The air sacs may fill with…
Polycystic Ovary Syndrome
Polycystic ovary syndrome (PCOS) is a common hormonal and metabolic condition that can affect how the ovaries work. It may cause changes…
Polycythemia Vera
Polycythemia Vera is a rare, chronic blood cancer in which the bone marrow makes too many red blood cells. It may also…
Polymyalgia Rheumatica
Polymyalgia rheumatica is an inflammatory condition that causes pain and stiffness around the shoulders, hips, and neck. It mainly affects adults over…
