Postherpetic neuralgia may be severe, continous and hard to control. During the past years, many challenges have made to ameliorate it. Although there was no encouriging evidences that treatment with antiviral agents, corticosteroids, local and regional anesthesia were effective, recent studies with respect to antidepressants, neuroleptics, anticonvulsants and TENS have shown some considerable effects. In this study, We randomly divided twenty-two patients suffering from postherpetic neuralgia into two groups. Thirteen patients were treated by infrared, 6 times per week for 4 weeks, as a control. Visual analogue scale was used as a tool for pain evaluation, which was checked weekly during 1 month and the difference from before-treated and after-treated mean score was compared by paired t-test at each week. Visual analogue score in TENS-applied group had statiically significant decrement of score from the 2nd week in portable TENS treated group, but there is no significant decrement in the control group. Hospital-visiting days in TENS treated group were 5.5 days and the other were 23.8 days. We concluded that self-administrated portable TENS has beneficial effect on postherpetic neuralgia patients. Not only one's pain but also hospital-visiting days were decreased and there was no adverse effect.