10. Cyclic Vomiting Syndrome
This is basically another variant of mad cow disease found in humans except this one has only ever occurred in Papua New Guinea and is suspected to have been transmitted via cannibalism.
Another hemorrhagic fever virus, Lujo has a lot in common with Ebola and the Margburg virus and was observed in South Africa and Zambia in 2008.
6. Twentieth-Century Disease
Also know as multiple chemical sensitivity, or MCS, this disease is characterized by negative reactions to various modern chemicals and products including plastics and synthetic fibers. Similar to the electromagnetic sensitivity, patients will not react when they do not know they are being exposed to the chemicals (blinded test), but do react when they are unblinded.
5. Dancing plague
The most oft-cited incident of this happened in 1518 in Strasbourg, France when a lady by the name of Frau Troffea began dancing for no apparent reason. Hundreds of people joined her for the next several weeks and eventually many of them died of exhaustion. Possible reasons put forth include mass poisoning or psychogenic illness.
3. Porphyria disease
Some scientists believe this disease is actually responsible for vampire and werewolf legends. Why? The skin of those afflicted by the illness will bubble and boil when exposed to sunlight and their gums recede almost giving the appearance of fangs. The weirdest part? Their poop turns purple.
1. Jumping Frenchmen of Maine Disorder
First documented by George Miller Beard in 1878, the disease has only been found to affect French-Canadian lumberjacks in the northern Maine region. It causes them to startle easily, hence the name. Furthermore, they seem to carry out almost any basic command as long as you shout it at them. Doctors think the issue may be genetic.