Clonus in involuntary muscle spasms, causes, tests, and treatment


When doctors check reflexes, they don’t always get a normal response. Clonus, a type of hyperactive reflex, is a rhythmic response to reflex testing. Instead of just one movement, a series of repetitive reflex movements are observed. Clonus reveals a problem with the nerve cells in the brain that control movement, or the wires that they send down through the spinal cord. Damage to these brain cells or their wires allows nerve cells in the spinal cord to activate muscles excessively. This causes hyperactive reflexes and clonus. Common causes of clonus are multiple sclerosis, strokes, tumors and trauma.

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Created by marieflores 4 years 26 weeks ago – Made popular 4 years 25 weeks ago
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