<prompt> Uhthoffs symptom is seen in:Multiple sclerosisPoliomyelitisGuillain-Barre syndromeMyasthenia gravis  <response>: Heat sensitivity refers to neurologic symptoms produced by an elevation of the bodys core temperature. Uhthoffs symptom is the unilateral visual blurring that may occur during a hot shower or with physical exercise. It is also common in Multiple sclerosis. Such heat-related symptoms probably result from transient conduction block. Ref: Harrisons principles of internal medicine, 18th edition, Page: 3398. 