Hyperreflexia

Overactivity of physiological reflexes, presenting as exaggerated deep tendon or other muscle stretch reflex responses, typically associated with upper motor neuron lesions or loss of supraspinal inhibitory control. Possible causes are spinal cord injury, multiple sclerosis, ALS, stroke, brain trauma, cervical myelopathy, anxiety, hyperthyroidism, hypocalcemia, serotonin syndrome, and vitamin B12 deficiency.