This study aimed to examine the Intra-Tester Reliability and Test-Retest Reliability by measuring Pressure Pain Threshold with chronic Myofascial pain with stress in 20 patients (8 male, 12 female. ) Age 20-60 years by using a digital WE algometer, Each measurements was 3 time in the Upper Trapezius muscles were measured for 2 days to determine the ICC value of the Pressure Pain Threshold. Day 1 was ICC (3,1) value = 0.90 ( 0.796 to 0.956, Day 2 ICC (3,1) value = 0.882 (0.774 to 0.947). Conformity is high. When comparing both days, on day 1 and day 2, the Test-Retest Reliability was ICC (2,1) value = 0.923 (0.818 to 0.969). The consistency was high p < 0.05, When the Intra-Tester Reliability of the Test - Retest Intra-Tester Reliability was specific to the sensory perception of the Upper Trapezius muscles in the pressure response and pain perception. In value of the degree of pain sensation effectively.