People with red hair feel more pain than blondes or brunettes

People with red hair feel more pain than people with blond or dark hair. It is scientificaly proven that people with red hair need about 20% more anaesthetic during operations than other patients.

The cells that produce skin and hair pigment have a dysfunctional melanocortin 1 receptor in people with red hair.
This dysfunction triggers the release of more of the hormone that stimulates these cells, but this hormone also stimulates a brain receptor related to pain sensitivity.
This causes people with red hair to be more sensetive to pain.
Poor redheads!

Source: http://www.newscientist.com/article.ns?id=dn2923

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