According to Collis Harvey, people with red hair produce more adrenaline than non-redheads and their bodies access it more speedily, making the transition to the fight-or-flight response more natural for them than for others. Red hair, it seems, is primarily a story of difference.

Does red hair affect personality?

If you are a redhead, you may be romantic or passionate. You may get angry easily and be opinionated. You also might get excited or enthusiastic more easily.