The folklore of vampires inspired horror stories for centuries around the globe, resulting in Hollywood being flooded with Vampire stories that produced some of the most watched movies of the 21st century.

Now, according to new research, these creatures may have been real, and the reason for their existence could be the result of a rare disease.

Scientists have concluded that Erythropoietic protoporphyria (EPP) could be the reason behind the ancient vampire legends, according to a study that a multidisciplinary team has published in the journal PNAS.

As it turns out, people suffering from EPP, a type of protoporphyrin called protoporphin IX accumulates in the red blood cells, plasma and sometimes the liver, makes them go ‘Vampirish’ in a way.

Experts note that when protoporphin IX is exposed to light, it produces chemicals that damage surrounding cells.

Those suffering from this disease have a remarkable photosensitivity to ultraviolet radiation that causes inflammation, burning, and redness in the skin. Experts indicate how prolonged exposure to the sunshine can cause painful, disfiguring blister—even trace amounts of sunlight that pass through window glass can cause damage.

“People with EPP are chronically anemic, which makes them feel very tired and look very pale with increased photosensitivity because they can’t come out in the daylight,” says Barry Paw MD, Ph.D., of the Dana-Farber/Boston Children’s Cancer and Blood Disorders Center.

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