As complication of dorsomedial thalamotomy, hemiplegia, disturbance of consciousness, urinary incontinence, abnormality of reflex function, slight ataxia, slight disturbance of sensation, decreasing of appetite and weight, severe headache, etc. were observed, however excepting of hemiplegia, those side-effects seemed to be transient and to tend to extinguish within about a half month after operation. In adding to an existence of possibility of thalamotomy for clinical practice, that complete recovery of somatic condition might need at longest one month after operation, was concluded.