Only about 2 percent of people have naturally red hair.
Redheads are more sensitive to some kinds of pain and less sensitive to others. The explanation for these differences could be found in their genetic makeup.
An increasing number of studies show that redheads are differently constituted in terms of pain perception and body reactions. Research reveals that redheads:
are more sensitive to cold
suffer more from toothaches and are more frightened of dentists
are at greater risk of developing sclerosis and endometriosis
Some studies indicate that redheads are more prone to illness because they prefer to keep out of the sun and so lack vitamin D, or because their ability to absorb the vitamin is less efficient.
Even though only 2 percent of people have red hair, 4 percent have the gene that makes redheads. (If you have freckles, you’re probably a carrier). So, while two redheads won’t produce a brunette, two brunettes could produce a redhead. Did you know that red hair and blue eyes are the rarest hair and eye color combination in the world?
Another fun fact about redheads, they’re more likely to be left-handed.
One of the many facts about redheads is that their hair will never turn gray. The pigment in their hair that causes it to be red will just fade over time, causing their hair to turn blonde or white, but never gray.