The exact mechanism of the condition is unknown. Some studies have suggested the itching occurs in response to increased fibrinolytic activity in the skin, inappropriate activation of the sympathetic nervous system, increased activity of acetylcholinesterase, or an increase in mast cell degranulation that releases histamine and other chemicals into the body.
Aquagenic pruritus
Psychogenic pruritus
Uremic pruritus
Cholestatic pruritus
Hydroxyethyl starch-induced pruritus
Pathergy
Grocer's itch
Irritant diaper dermatitis