Vampires

It's challenging to pinpoint the exact historical origins of vampires. Numerous ancient cultures, dating back to the Mesopotamians and Romans, had mythical monsters that, if not named vampires, were quite similar to them in practice. There is a fairly common perception of a monster that feeds on the blood of the living. For what it's worth, the word "vampire" appears to have first appeared in English in 1734.

While there have been many theories put forth to explain the historical belief in vampires, such as people being buried alive, grave robbers, or the deceased's gums receding from their teeth giving the appearance of having more pronounced teeth, there are also some other, more scientific explanations.

There are a number of blood conditions that can affect people who may have been viewed as vampiric by ancient humans. A disorder known as erythropoietic protoporphyria can lead you to become extremely sensitive to light and can start in childhood. You can blister and get burned in the sun.

Those who have this illness are persistently anemic, making them very pale. The UV rays from the sun would irritate them even on gloomy days. So, it is most likely that these pale individuals only emerge at night.