Absence of menstruation. Amenorrhea is conventionally divided into primary and secondary amenorrhea. With primary amenorrhea, menstruation never takes place. It fails to occur at puberty. With secondary amenorrhea, menstruation starts but then stops. The absence of menstruation during pregnancy is a form of physiologic amenorrhea, physiologic in the sense that it is completely normal and is not caused by anything pathologic. Amenorrhea during lactation is another type of physiologic amenorrhea. The word “amenorrhea” is compounded from three Greek roots “a-“, no + “men”, month + “rhoia”, flow = no monthly flow. Amenorrhea is less commonly called amenia.
- Primary amyloidosis
A disorder of plasma cells (special white blood cells that produce antibodies), this is one of a group of diseases (called amyloidosis) in which protein deposits (amyloid) accumulate in one or more organ systems in the body. Primary amyloidosis is the most common type of amyloidosis in many countries including the U.S. The protein deposits […]
- Primary atelectasis
Failure of the lung to expand fully at birth. In contrast to secondary atelectasis in which there is partial or complete collapse of a lung that once had expanded, as may happen after chest surgery.
- Primary biliary cirrhosis (PBC)
A liver disease caused by an abnormality of the immune system. Small bile ducts within the liver become inflamed and obliterated. Backup of bile causes intense skin itching and yellowing of the skin (jaundice). Lack of bile decreases absorption of calcium and vitamin D, leading to osteoporosis. Cirrhosis (scarring of the liver) develops over time.
- Primary care
A patient’s main source for regular medical care, ideally providing continuity and integration of health care services. All family physicians, and many pediatricians and internists, practice primary care. The aims of primary care are to provide the patient with a broad spectrum of preventive and curative care over a period of time and to coordinate […]
- Primary care provider
In insurance parlance, a physician who is chosen by or assigned to a patient and both provides primary care and acts as a gatekeeper to control access to other medical services.