DESCRIPTION * When the body's immune system reacts adversely to medication, it can exhibit an allergic (rejection) reaction. Any medicat...
Alopecia Areata
DESCRIPTION * Alopecia areata causes development of bald patches on the scalp. Although it is a relatively uncommon cause of hair loss in ch...
Alport's Syndrome
DESCRIPTION * Alport's syndrome is a common cause of hematuria (blood in the urine). It is responsible for about 15% of childhood cases ...
Alveolar Hemorrhage Syndromes
DESCRIPTION * Alveoli are the tiny air sacs in the lung where oxygen is brought into the blood and carbon dioxide is released. Many diseases...
Amaurosis Fugax
ALSO KNOWN AS Fleeting blindness DESCRIPTION * Emboli (blood clots) travel from the carotid artery (near the heart) to the retinal arteries,...
NORMAL ABNORMAL DESCRIPTION * This is an Abscess (walled area of infection/pus) in the liver that is caused by the organism Entamoeba histol...
Amphetamine Abuse
ALSO KNOWN AS "Cat", "crystal", "speed", "bennies", "ups", "jollies", "uppe...
Amphetamine-cocaine Abuse
ALSO KNOWN AS * Some of the common street names for cocaine include "big C", "blow", "nose candy", "coke&...
Amyloidosis
DESCRIPTION * Amyloidosis is a condition in which amyloids, i.e., protein fibrils (minute fibers) not normally present in the body, become d...
Anaerobic Infections
ALSO KNOWN AS Gas gangrene, clostridial myonecrosis, or necrotizing infections DESCRIPTION * This disease is caused when the bacteria in the...
Anaerobic Pneumonia
ABNORMAL NORMAL ALSO KNOWN AS Lung abscess DESCRIPTION * Anaerobes are bacteria that live where there is no oxygen. A lung Abscess is a coll...
Anal Abscess
ALSO KNOWN AS Anorectal abscess, perianal abscess, or rectal abscess DESCRIPTION * Stool formed in the colon or large intestine empties into...
Anal Cancer
ABNORMAL NORMAL DESCRIPTION * This is a tumor in the anal canal, specifically, squamous cell (a specific cellular type) carcinoma of the anu...
Anal Fissures
DESCRIPTION * This is a cut (ulcer or laceration) inside the anus. The usual cause is Trauma to the anus because of a strained bowel movemen...
Anal Fissures
Abnormal Normal DESCRIPTIONS * This is a cut (ulcer or Laceration) inside the anus. The usual cause is trauma to the anus because of a strai...
Anaphylaxis
DESCRIPTION * Anaphylaxis is a severe generalized allergic reaction characterized by widespread dilation of the blood vessels of the body, r...
Anaplastic Thyroid Cancer
DESCRIPTION * Anaplastic thyroid carcinoma is the least common type of Thyroid Cancer of the ones that begin in the gland itself. This is a ...
Anemias
DESCRIPTION * Oxygen is carried to the body's tissues predominantly by red blood cells. There is a near-constant level of blood cells th...
Angiodysplasia
ALSO KNOWN AS Vascular ectasias DESCRIPTION * It is theorized that veins in the colon become damaged over time. This causes capillaries to d...
Angioedema
ALSO KNOWN AS Angioneurotic edema DESCRIPTION * This is a syndrome of swelling in the deep layers of the skin. Lip swelling is usually promi...