Hyperreflexia
Template:Short description Template:Multiple issues Template:Infobox medical condition (new)Hyperreflexia is overactive or overresponsive bodily reflexes. Examples of this include twitching and spastic tendencies, which indicate disease of the upper motor neurons and the lessening or loss of control ordinarily exerted by higher brain centers of lower neural pathways.Template:Cn
Spinal cord injury is the most common cause of hyperreflexia.Template:Cn Standard stimuli, such as the filling of the bladder, can cause excessive responses from the nervous system. The causes of hyperreflexia are not known.Template:Cn
Hyperreflexia also has many other causes, including the side effects of drugs (e.g., stimulants), hyperthyroidism, electrolyte imbalance, serotonin syndrome, severe brain trauma, multiple sclerosis, Reye syndrome, and pre-eclampsia.Template:Cn
Recovery from hyperreflexia can occur several hours to several months after a spinal cord injury; the phase of recovery is likely to occur in stages rather than on a continuum.<ref name="hyper">Little, J., Ditunno, J. F., Stien, S., A., Harris, R. M. (1999). "Incomplete spinal cord injury: Neuronal mechanisms of motor recovery and hyperreflexia. Archives of Physical Medicine and Rehabilitation 80 (5): 587-599.</ref> The late stage is between two weeks and several months.<ref name="hyper" /> Patients with a severe spinal cord injury mainly present with a later stage of recovery because during the early stages they present with spinal shock.<ref name="hyper" /> Reflex and motor recovery can sometimes occur simultaneously.<ref name="hyper" />
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Template:Nervous and musculoskeletal system symptoms and signs