Allodynia is the appearance of pain when exposed to stimuli that normally do not cause pain. It is noted in causalgia, neuropathies and polyneuropathies, herpes zoster, multiple sclerosis, migraine, condition after spinal cord injuries, strokes, spinal operations. To establish the cause of allodynia, data from a survey, general and neurological examination, electrophysiological, neuroimaging and laboratory studies are used. Treatment - analgesics, blockade with anesthetics, vitamins, antidepressants, physiotherapy techniques. Surgery is sometimes recommended.