Background: Only few studies has been documented the incidence of PDPH with 25 or 27 G (Quincke or Whitacre) needles in patients who had an early ambulation. The present study was designed to evaluate the effect of gauge of needle (25 or 27), shape or type of needle (Quincke or Whitacre) and ambulatory time.Materials & Methods: In this randomised prospective study 100 ASA physical status I & II adult patients of both sex undergoing lower limb surgery under subarachnoid block were assigned in to four groups of 25 patients each; they received spinal anaesthesia either with Quincke`s (I & II) AND Whitacre (III & IV) spinal needles. The incidence of PDPH, no. of attempts required for successful insertion were recorded. The primary objective of study was to find out the difference in the incidence of PDPH, if any, between the two groups, by using the t-test and Chi square test.Results: All the 100 patients completed the study. Significantly high rate of PDPH was recorded in Quincke 25G (20%), & IN 27G (12%) as compared to Whitacre (25 or 27) G (4%). This was statistically significant (P. value <.05).Conclusion: Overall to reduce the number of attempts and the incidence of PDPH, Whitacre 25G spinal needle has better option than Quincke 25G or 27G spinal needle for subarachnoid block.