Category: U

Urticaria caused by an allergic reaction to a drug (e.g., a sulfa drug).  

Urticaria following slight irritation of the skin.  

Urticaria that develops after exposure to high ambient temperatures (e.g., after exercise, a warm shower or bath, or during a fever). The hives that develop are typically small (1 to 3 mm) and are often surrounded by erythema.  

Eruption of temporary vesicles with infusion of fluid under the epidermis.  

The scientific name for the stinging nettle, an herb used to treat allergic conditions such as allergic rhinitis. Exposure to the herb can cause a rash. Extracts made from it are promoted for their diuretic effects.  

Yellow pigment of the urine; an indigo-forming substance.  

Porphyria in which an excess amount of uroporphyrin is excreted in the urine.  

A device for estimating the amount of phosphorus in the urine.  

A microorganism capable of causing disease of the urinary tract.  

Dilatation of the renal structures from obstruction of the urinary flow; distention of the renal pelvis and tubules with urine.