Title: Effectiveness of Transcutaneous Electrical Nerve Stimulation (TENS) on pain and behavioural responses among primigravid mothers during first stage of labour, at labour ward, Government Rajaji Hospital. Objectives: To assess the level of pain and behavioural responses. To evaluate the effectiveness of TENS on pain and behavioural responses. To associate the level of pain and behavioural responses among primigravid mothersand their socio demographic and obstetrical variable.To correlate the level of pain and behavioural responses. Hypotheses: There is a statistically significant difference between pretest and posttest level of pain and behavioural responses. There is a statistically significant difference between posttest level of pain and behavioural responses. There is a statistically significant association between the level of pain and behavioural responses among primigravid mothers and their socio demographic and obstetrical variables. There is a statistically significant correlation between the level of pain and behavioural responses. Methodology: True experimental – pretest posttest control group design used. 60 subjects selected by Simple random sampling. Intervention was given four times a day. Results: Karl pearson coefficient of correlation r =0.46 at p ≤0.001 level of significance. Conclusion: TENS is a simple, non-invasive, non-pharmacological, alternative method used in labour ward.