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The purpose of this quisi experimental research was to study the effect of transcoutaneous electrical nerve stimulates (TENS) with different frequencies in postoperative pain in 90 patient undergoing abdominal surgery. 30 patients received TENS with 5 HZ (group A), 30 patients received TENS with 80 HZ (group B) and 30 patients received TENS with 20 HZ (group C). Pain relisf in group B (high frequency) was significant compared to other group (P<0.05). Group B required less doses of analgesics unlike other groups (P<0.05). The data suggest that TENS with high frequency (80 HZ) minimize the postoprative pain in patients with abdominal surgery.