A rare disease called "porphyria" could be the reason that ordinary people in the Middle Ages took over vampires, physicians consider.
fact that the disease affects the red blood corpuscles, whereby they start correctly synthesized.
As a consequence, in the human body is formed by a chronic shortage of oxygen and iron, as well as formed an overabundance of porphyrins.
Under the influence of sunlight these substances have toxic properties - it leads to the fact that the human skin becomes pale, begin to appear sores on the lips and gums, and teeth turn into bloody fangs.
Scientists believe that such people suffering from this rare disease in the past and called vampires, as sunlight causes them great pain, and some of them for the treatment of blood used in food animals.