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Related to Lhermitte's sign: Uhthoff's phenomenon
a sensation like an electric shock coursing down the spine when the neck is flexed; a fairly common sign in multiple sclerosis.
Etymology: Jacques J. Lhermitte, French neurologist, 1877-1959
sudden, transient, electric-like shocks spreading down the body when the head is flexed forward, occurring chiefly in multiple sclerosis but also in compression disorders of the cervical spinal cord. The sign is usually elicited by the examiner when the patient is supine.