Abstract Background: Post dural puncture headache (PDPH) is a complication of spinal and epidural anesthesia defined by a very severe dull, non-throbbing positional headache along with nausea, vomiting and other symptoms. According to the positional character of PDPH, through this study we compared the effect of Abdominal support in the prevalence of the headache. Materials and Methods: 400 patients participated in this study among whom some needed with and without abdominal support just after operation , based upon the type of operations required. We compared the rate of PDPH between the two groups. Results: Eight(4%) of the patients with abdominal support after the procedure and twenty five of the patient without abdominal support (12.5%) had headache. Conclusion: Abdominal support after operation seems to be a reliable way to reduce PDPH occurrence following spinal or epidural puncture, although it needs more trials in this regard. Keywords: Post Dural Puncture Headache, Spinal anesthesia,abdominal support صفحه