Vampires of Medicine

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 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 then-current medical knowledge. 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 stay alive for any extended period without food, water or fresh air. An alternate explanation for noise is the bubbling of escaping gases from natural decomposition of bodies. Another likely cause of disordered tombs is grave robbing.

Folkloric vampirism has been associated with clusters of deaths from unidentifiable or mysterious illnesses, usually within the same family or the same small community. The epidemic allusion is obvious in the classical cases of Peter Plogojowitz and Arnold Paole, and even more so in the case of Mercy Brown and in the vampire beliefs of New England generally, where a specific disease, tuberculosis, was associated with outbreaks of vampirism. As with the pneumonic form of bubonic plague, it was associated with breakdown of lung tissue which would cause blood to appear at the lips.

In 1985 biochemist David Dolphin proposed a link between the rare blood disorder porphyria and vampire folklore. Noting that the condition is treated by intravenous haem, he suggested that the consumption of large amounts of blood may result in haem being transported somehow across the stomach wall and into the bloodstream. Thus vampires were merely sufferers of porphyria seeking to replace haem and alleviate their symptoms. The theory has been rebuffed medically as suggestions that porphyria sufferers crave the haem in human blood, or that the consumption of blood might ease the symptoms of porphyria, are based on a misunderstanding of the disease. Furthermore, Dolphin was noted to have confused fictional (bloodsucking) vampires with those of folklore, many of whom were not noted to drink blood. Similarly, a parallel is made between sensitivity to sunlight by sufferers, yet this was associated with fictional and not folkloric vampires. In any case, Dolphin did not go on to publish his work more widely. Despite being dismissed by experts, the link gained media attention and entered popular modern folklore.

Rabies has been linked with vampire folklore. Dr Juan Gómez-Alonso, a neurologist at Xeral Hospital in Vigo, Spain, examined this possibility in a report in Neurology. The susceptibility to garlic and light could be due to hypersensitivity, which is a symptom of rabies. The disease can also affect portions of the brain that could lead to disturbance of normal sleep patterns (thus becoming nocturnal) and hypersexuality. Legend once said a man was not rabid if he could look at his own reflection (an allusion to the legend that vampires have no reflection). Wolves and bats, which are often associated with vampires, can be carriers of rabies. The disease can also lead to a drive to bite others and to a bloody frothing at the mouth.
In his 1931 treatise On the Nightmare, Welsh psychoanalyst Ernest Jones noted that vampires are symbolic of several unconscious drives and defence mechanisms. Love, guilt, and hate are emotions that fuel the idea of the return of the dead to the grave. Desiring a reunion with loved ones, mourners may project the idea that the recently dead must in return yearn the same. From this arises the belief that folkloric vampires and revenants visit relatives, particularly their spouses, first. However in cases where there was unconscious guilt associated with the relationship, the wish for reunion may be subverted by anxiety. This may lead to repression, which Freud had linked with the development of morbid dread. Jones surmised in this case the original wish of a (sexual) reunion may be drastically changed: desire is replaced by fear; love is replaced by sadism, and the object or loved one is replaced by an unknown entity. The sexual aspect may or may not be present. Some modern critics have proposed a simpler theory: people identify with immortal vampires because by so doing they overcome, or at least temporarily escape from, their fear of dying.
The innate sexuality of bloodsucking can be seen in its intrinsic connection with cannibalism and folkloric one with incubus-like behaviour. Many legends report various beings draining other fluids from victims, an unconscious association with semen being obvious. Finally Jones notes that when more normal aspects of sexuality are repressed, regressed forms may be expressed, in particular sadism; he felt that oral sadism is integral in vampiric behaviour.

If you still don't believe in the psychology and physiology of the Vampires, religion is the word for you to follow.

Coming next in the line of blogs aimed to explain the supernatural in terms of Medical Science is "The Cry of Werewolf".