A reaction of the senses that begins when an internal or external stimulus triggers itch receptors in the skin.

an irritating cutaneous sensation that produces a desire to scratch

An uncomfortable sensation in the skin that feels as if something is crawling on the skin or in the skin, and makes the person want to scratch the affected area. See the entire definition of Itching

A sensation on the skin that makes a person want to scratch the area affected.

(2) - medically known as pruritis, can result from drug reaction, food allergy, kidney or liver disease, cancers, parasites, aging or dry skin, contact skin reaction, such as poison ivy, and for unknown reasons.