Opisthotonos: What It Is, Causes, Symptoms & Treatment

May 10, 2026

Opisthotonos (pronounced “op-is-THOT-in-us”) is a reflex muscle movement. You might also see it spelled “opisthotonus.” It’s an uncontrolled flexing of muscles throughout your neck and back. It usually happens when a person is unconscious or unable to control muscle movements in their neck and back.

https://my.clevelandclinic.org/health/symptoms/opisthotonos

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