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In the past five years, researchers have found that the genetic mutation responsible for redhead's ruby tresses and snow-white skin also makes them more sensitive to hot and cold -- and it could also make them a whole lot harder to numb up.

Not only are they more likely to burn when the mercury rises, but they also feel the most pain when it drops.

They may be more sensitive to certain types of pain and can require higher doses of some pain-killing medications. However, studies suggest that their general pain tolerance may be higher. People with red hair also respond more effectively to opioid pain medications, requiring lower doses.

Not only are they more likely to burn when the mercury rises, but they also feel the most pain when it drops. Researchers at Louisville University in Kentucky have discovered that people with ginger hair are more sensitive than most.

As a group, redheads seem to be more likely to develop certain health conditions and have certain health risks. These include: Increased skin cancer risk. Altered sensitivity to pain.

They may be more sensitive to certain types of pain and can require higher doses of some pain-killing medications. However, studies suggest that their general pain tolerance may be higher. People with red hair also respond more effectively to opioid pain medications, requiring lower doses.

Rarest kind of redhead Having red hair and blue eyes is the rarest hair/eye color combination possible. The odds of a person having both of those recessive traits is around 0.17%. Instead, most redheads have brown, hazel or green eyes, according to Medical Daily.

Susceptible to sunburn - and melanoma While it makes redheads more susceptible to sunburn, that very sensitivity to ultraviolet rays also allows their bodies to produce more vitamin D, which is essential to bone development and good health.

For example, one study published in 2016 in Current Biology found that adults who carry two copies of the MC1R gene variant are more likely to look two years older than other people their age. That wasn't because redheads had more wrinkles, which you might guess since they're more prone to sun damage.

The redhead's lifespan is greatly affected by disease, including Duck Virus Enteritis, avian botulism and poisoning from lead pellets discarded from shotgun shells; the oldest known redhead lived 22 years after banding.

In the Bible, we learn that Judas has red hair and Satan, himself, is sometimes illustrated as a Red Dragon with red hair. To understand the belief of that time, one can add that Eve and Bathsheba, the two temptresses with red hair, brought Adam and the King David to their downfalls.

blue eyes Rarest kind of redhead Having red hair and blue eyes is the rarest hair/eye color combination possible. The odds of a person having both of those recessive traits is around 0.17%. Instead, most redheads have brown, hazel or green eyes, according to Medical Daily.

blue eyes Rarest kind of redhead Having red hair and blue eyes is the rarest hair/eye color combination possible. The odds of a person having both of those recessive traits is around 0.17%. Instead, most redheads have brown, hazel or green eyes, according to Medical Daily.

One of the many facts about redheads is that their hair will never turn grey. 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 grey.

One of the many facts about redheads is that their hair will never turn grey. 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 grey.