Red hair is a recessive gene that occurs in about 2 percent of the worlds population. Redheads have a reputation for having bad tempers. Redheads have a higher tolerance for spicy foods. Redheads need 20 percent more anesthesia than people with other hair colors.

Do redheads get more angry?

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.