Pain 1
Pain 1 :
(Physiol; Psych) An unpleasant physical sensation induced by an injury or intense stimulus, such as excessive light or noise, extremes of heat and cold, irritating chemicals, electric shock, etc. NOTE: Bruises, swellings, and severe exposure to heat or sun produce hyperalgesia, a heightened sensitivity of the skin to pain. The heat pain threshold of the skin ranges from 210 to 480 millicalories (0. 21 to 0. 48 g-cal/sec/cm2), with over 20 discriminable levels of pain intensity. A temperature of 52ºC (126ºF) is sufficient to produce thermal pain and tissue injury. Sound pressure above 120 dBA is usually sufficient to cause pain in the human ear
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