Vampire
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Paul Barber in his book Vampires, Burial and Death has described that belief in vampires resulted from people of pre-industrial societies attempting to explain the natural, but to them inexplicable, process of death and decomposition. People sometimes suspected vampirism when a cadaver did not look as they thought a normal corpse should when disinterred. However, rates of decomposition vary depending on temperature and soil composition, and many of the signs are little known. This has led vampire hunters to mistakenly conclude that a dead body had not decomposed at all, or, ironically, to interpret signs of decomposition as signs of continued life. Corpses swell as gases from decomposition accumulate in the torso and the increased pressure forces blood to ooze from the nose and mouth. This causes the body to look "plump," "well-fed," and "ruddy"—changes that are all the more striking if the person was pale or thin in life. In the
Pathology
Arnold Paole case, an old woman's exhumed corpse was judged by her neighbours to look more plump and healthy than she had ever looked in life. The exuding blood gave the impression that the corpse had recently been engaging in vampiric activity. Darkening of the skin is also caused by decomposition. The staking of a swollen, decomposing body could cause the body to bleed and force the accumulated gases to escape the body. This could produce a groan-like sound when the gases moved past the vocal cords, or a sound reminiscent of flatulence when they passed through the anus. The official reporting on the Peter Plogojowitz case speaks of "other wild signs which I pass by out of high respect". After death, the skin and gums lose fluids and contract, exposing the roots of the hair, nails, and teeth, even teeth that were concealed in the jaw. This can produce the illusion that the hair, nails, and teeth have grown. At a certain stage, the nails fall off and the skin peels away, as reported in the Plogojowitz case—the dermis and nail beds emerging underneath were interpreted as "new skin" and "new nails". It has also been hypothesized that vampire legends were influenced by individuals being buried alive because of shortcomings in the medical knowledge of the time. In some cases in which people reported sounds emanating from a specific coffin, it was later dug up and fingernail marks were discovered on the inside from the victim trying to escape. In other cases the person would hit their heads, noses or faces and it would appear that they had been "feeding." A problem with this theory is the question of how people presumably buried alive managed to