Wikipedia
Pasma refers to a " folk illness" unique to the Filipino culture that is said to be most commonly brought about by exposure of "cold" and water in many forms: water is believed to facilitate the unhealthy coldness that enters the body in the Filipino culture. There are distinct signs, symptoms, perceived causes and treatments which are recognized in the folk medicine of the Philippines, but these are not described in medical textbooks, discussed in medical schools, or generally recognized by contemporary medical science. Although, these symptoms have been perceived and testified as verifiable by Filipinos who have experienced sickness after a long hard day of work and abruptly taking a cold shower.
University of the Philippines anthropologist Michael Tan points out:
I've been lecturing in several medical schools for several years now and I keep urging health professionals to be more inquisitive about these illnesses because even if these are not recognized by mainstream medicine, the ailments are very real as far as people are concerned, causing suffering and may even be cited as the cause of death, as in the case of " bangungot."
Alongside numerous diseases recognized by Filipino folk medicine, pasma is attributed to an interaction of "init" (heat) and "lamig" (cold). Under certain conditions, the body's muscles (kalamnan) are said to be "hot" and should not be too quickly brought into contact with "cold," in this case usually meaning cold water or air conditioner.
Pasma is a genus of skippers in the family Hesperiidae.