TENS in Labor is Safe
Transcutaneous electrical nerve stimulation (TENS) is safe for use during labor, with no reported adverse events for mothers or infants across multiple systematic reviews and randomized controlled trials. 1, 2, 3
Safety Profile
The evidence consistently demonstrates that TENS poses no safety concerns:
- No adverse maternal or fetal events reported in any of the systematic reviews examining this intervention 2, 3
- The most recent and comprehensive meta-analysis (2026) including 51 RCTs with 10,038 participants found "little to no difference in adverse events" when comparing TENS to blank control or epidural analgesia 1
- This represents the highest quality evidence available, with data spanning from inception through July 2025
Mechanism and Application
TENS is a noninvasive electrophysical method that emits low-voltage electrical impulses 4, 3. The typical application involves:
- Electrodes placed on the lower back during labor
- High-frequency stimulation (15-100 Hz) used during active phase 4
- Patient-controlled operation, which may enhance sense of control 3
Efficacy Context
While safety is established, the efficacy evidence shows:
- Modest pain reduction: approximately 2 cm decrease on VAS compared to control 1
- Shortened first stage of labor: 47 minutes shorter versus control, 62 minutes shorter versus epidural 1
- High patient satisfaction: majority of women would use TENS again in future labor 2, 3
- Most effective when applied to acupuncture points for reducing severe pain 2, 3
Clinical Considerations
TENS should be offered as a patient choice option given its safety profile and patient preference, despite limited analgesic efficacy 2. The 2026 neuraxial anesthesia guidelines 5 do not specifically address TENS, focusing instead on neuraxial and pharmacological approaches for cesarean delivery—this absence from guidelines reflects TENS's role as an adjunctive, patient-preference option rather than a primary analgesic strategy.
The key clinical point: no safety concerns exist to justify withholding TENS from women who wish to use it, even though it provides only modest pain relief compared to neuraxial techniques.