Authors experienced three cases of comatous patient, accompanied with headache and convulsion following spinal anesthesia for hysterectomy, reduction of intuegussuption and appendectomy in the private clinics. Three cases suspecting chemical or asceptic meningitis were treated under the proper fluid and symptomatic therapy with oxygen inhalation and maintenance of airway. One case which had cardiopulmonary arrest at the private clinic, died after two days' admission. Two cases recovered within 4 and 7 days without any specific neurological complications.