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.
Pain in the left half of the head is observed with migraine, paroxysmal hemicrania, hypnic and cluster headache, vertebrobasilar insufficiency. It is detected at the initial stage of brain tumors, with limited arachnoiditis, Horton's disease, some ENT diseases and pathologies of the cervical spine. It can be acute, dull, prolonged, paroxysmal, pressing, bursting, breaking, pulsating. The cause is established on the basis of complaints, interview data, neurological examination, additional studies. As part of therapeutic measures, NSAIDs, triptans, steroids, caffeine preparations, and physiotherapy are prescribed. Sometimes operations are performed.