&NA;Four cases of acute hyperesthesia after spinal trauma are presented. An attempt is made to characterize the natural history of this syndrome. In the three cases with truncal sensory aberration, hyperesthetic zones developed only anteriorly. All four patients demonstrated spontaneous relief of pain within 2 weeks after injury. The pain was modified by transcutaneous stimulation in one case and byl‐dopa in another case. It is suggested that the “lesion” responsible for the hyperesthetic response is partial damage to dorsal root fibers at a point medial to the dorsal root ganglion.