Scratching an Itch Feels Good, But Why and Where
Scientists have already discovered why scratching an itch feels good, but does that pleasurable feeling apply to an itch anywhere on the body? A world-renowned itch expert has explored the effectiveness of scratching on three different sites on the body and also reported why this information is important.
Where does scratching an itch feel the best?
An itch is a common human occurrence, and scratching an itch generally feels good. However, what’s happening below the surface of the skin has puzzled researchers.
A study published in Nature Neuroscience in 2009 offered some clues when University of Minnesota neuroscientists suggested that the mechanism by which scratching an itch offers relief occurs not on the skin but deep within the central nervous system. More specifically, they noted (using a monkey model) that scratching involves the spinothalamic tract (STT) neurons in the spinal cord.
The scientists also pointed out that itching and scratching in humans likely has other components, including emotional and psychological factors.
In the current study, undertaken by itch expert Gil Yosipovitch, MD, PhD, professor of dermatology at Wake Forest Baptist Medical Center, and his team, the goal was to evaluate itch relief at different sites on the body. The investigators analyzed itch intensity and the amount of pleasure associated with scratching each itch location at 30-second intervals over a 5-minute period.
Eighteen volunteers participated in the study, during which the investigators applied cowhage spicules on a small area of skin on their ankles, forearms, and backs. Cowhage spicules is a tropical plant that causes intense itching when it makes contact with the skin.
Itching and scratch relief were less intense on the forearm. Yosipovitch also noted that “the pleasurability of scratching the ankle appears to be longer lived compared to the other two sites.”