Postdural puncture headache (PDPH) is probably the most common complication of spinal anesthesia. The incidence of spinal headache is believed to be related to age, sex, pregnancy, size of the dural puncture needle, direction of the needle bevel, and the angle at which the needle penetrates the dura. This study were done to see the relation of sex, age, needle size (23 gauge, 25 gauge 27 gauge needle) & bevel direction (parallel, perpendicular insertion to the longutudinal dural fiber) on the incidence, duration, severity, and location. The following results were observed: 1) The overall incidence of headache was 7.9% (49 cases). 2) The size of the needle was statistically significant assouation of PDPH. 3) Headache occured in highest frequency in patients in the second and third decades. 4) The frequency of PDPH was inversely associated with age. 5) The onset of headache was 1-2 days (68%) and duration of headache was 4-5 days (82%) in postanesthetic day. 6) The severity of headache was mild and moderate in 90% cases.