What is Itching?
Itching (Latin pruritus) is a skin sensation that provokes a desire to scratch (1). Itching occurs when certain substances produced by the body (e.g. biliary salts, histamine) or those coming from the outside (e.g. wool, nickel) irritate nerve endings in the skin.
Itching is not the same as tingling and other abnormal sensations known as paresthesias, where nerves themselves are affected, while in itching they are not.
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