List the 4 main causes of itch
Pruritoceptive
Neuropathic
Neurogenic
Psychogenic
What is pruritoceptive itch?
Something in skin, usually dryness or irritant, that triggers itch
What is neuropathic itch?
Damage to the nervous system that causes itch
What is neurogenic itch?
Itch caused by drug effects on CNS receptors
What is psychogenic itch?
Delusions about itch