Diseases & conditions A-Z List
Diseases & Conditions A-Z List - «A»:
Acquired platelet function defect
Acquired platelet function defects are diseases or conditions that cause the blood elements needed for blood clotting (platelets) to not work properly. The term "acquired" means these diseases or conditions are not inherited, but instead develop independently in a person.
With platelet disor...
Acrodermatitis is a childhood skin condition that may be accompanied by mild symptoms of fever and malaise. It may also be associated with hepatitis B and other viral infections.
The cause of acrodermatitis is poorly understood, but its link with other infections is well- documented.
Acrodysostosis is an extremely rare disorder that is present at birth (congenital). People with this condition have problems in the bones of the hands, feet, and nose, and mental retardation.
Most patients with acrodysostosis have no family history of the disease. However, sometimes the cond...
Acromegaly is a chronic metabolic disorder in which there is too much growth hormone and the body tissues gradually enlarge.
Acromegaly occurs in about 6 of every 100,000 adults. It is caused by abnormal production of growth hormone after the skeleton and other organs finish growing.
An ACTH test measures ACTH, a hormone released from the anterior pituitary gland in the brain.
How the Test is Performed
Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care p...
ACTH (cosyntropin) stimulation test
ACTH (cosyntropin) stimulation test measures how well the adrenal glands respond to the hormone ACTH. ACTH is a hormone produced in the pituitary gland that stimulates the adrenal glands to release cortisol.
How the Test is Performed
The health care provider will measure the cortisol in your blood ...
Actinic keratosis is a precancerous growth on the skin.
Actinic keratosis is caused by sun exposure.
Risk factors for actinic keratosis include:
Having fair skin, blue or green eyes, or blond or red hair
Long-term, daily sun exposure (for example, if you work outdoors)
Multiple, severe sunb...
Actinomycosis is a long-term (chronic) bacterial infection that commonly affects the face and neck.
Actinomycosis is usually caused by an anaerobic bacteria called Actinomyces israelii, which is a common and normally not disease-causing (nonpathogenic) organism found in the nose and throat.
Acute means sudden or severe. Acute symptoms appear, change, or worsen rapidly. It is the opposite of chronic....
Acute adrenal crisis
Acute adrenal crisis is a life-threatening condition that occurs when there is not enough cortisol, a hormone produced by the adrenal glands.
The two adrenal glands are located on top of the kidneys. They consist of the outer portion, called the cortex, and the inner portion, called the medu...
Acute arterial occlusion - kidney
Acute arterial occlusion of the kidney is a sudden, severe blockage of the artery that supplies blood to the kidney.
The kidneys are very sensitive to the amount of blood that flows through them. Any reduction of blood flow through the renal artery can impair kidney function. If prolonged, a...
Acute bilateral obstructive uropathy
Acute bilateral obstructive uropathy is a sudden blockage of the flow of urine from both kidneys. The kidneys continue to produce urine in the normal manner, but because urine does not drain properly, the kidneys start to swell.
Chronic unilateral obstructive uropathy
Acute cerebellar ataxia
Acute cerebellar ataxia is sudden onset of uncoordinated muscle movement.
Acute cerebellar ataxia is most common in children, especially those younger than age 3. It often occurs several weeks after a viral illness.
Viral infections that may cause this include chickenpox, Coxsackie disease,...
Acute cholecystitis is a sudden inflammation of the gallbladder that causes severe abdominal pain.
See also: Chronic cholecystitis
In 90% of cases, acute cholecystitis is caused by gallstones in the gallbladder. Severe illness and, rarely, tumors of the gallbladder may also cause cholecysti...
Acute cytomegalovirus (CMV) infection
Acute cytomegalovirus (CMV) infection is a condition caused by a member of the herpesvirus family.
See also: Mononucleosis
Mononucleosis can be caused by several different viruses and a few types of bacteria. Unlike the more common form of mononucleosis, caused by the Epstein-Barr virus (EB...