- Lhermitte's phenomenon is a transient, sensory symptom which likens an electric shock that radiates down the spine or into the limbs.
- The sensation is triggered by neck flexion. The frequency with which they occur varies and the slightest movement of the head or neck may trigger it.
- This phenomenon occurs most frequently with multiple sclerosis, but can also be seen with other lesions of the cervical cord, including tumors, disc herniation, post-radiation myelopathy, and following trauma.
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