Inclusion criteria: The desire to participate in the study, age above 18 years, at least the reading and writing skills, not obese mother, awareness of time and space, nulliparous low-risk pregnancy, singleton pregnancy, gestational age 42-38 weeks, presentation cephalic and anterior occiput, birth weight 4000-2500 grams, infant alive, well and without anomalies, spontaneous vaginal delivery ( without use of vacuum and forceps) with mediolateral episiotomy, presenting pain in the episiotomy area (pain score 4 or more), absence of any genitourinary pathology, non use of epidural anesthesia, normal during the first, second and third stage of labor, non use of sedatives over the last 6 hours before study, lack of experience of TENS use, no history of epilepsy and mental disease, lack of cardiac pacemaker or cardiac arrhythmia disease, lack of drug addiction and smoking.
Exclusion criteria: Mother's request to exit at any stage of the study, the skin incision episiotomy more than 5 cm and less than 3 cm, banning the use of TENS like there is an open wound, side effects of TENS (burns, wounds, skin allergy), use of analgesics during data collection, delivery complications (abnormal postpartum bleeding, signs of infection, fever).