Home / TENS units

TENS unit for labor: an early-labor comfort tool, with honest limits

By the Life in Good Form editors. Updated 2026-10-12.

We research products from makers' specs and health sources; we do not run hands-on tests. Links to Amazon may earn us a commission at no cost to you. How this works.

How TENS is used in labor

The NHS describes the setup: electrodes are taped to your back and connected by wires to a small battery-powered stimulator that you hold. You control the small current yourself and can move around while using it. The NHS says TENS is believed to work by prompting the body to make more of its own natural painkillers, called endorphins, and by reducing pain signals sent to the brain through the spinal cord.

That sense of control is part of the appeal. You can turn it up through a contraction and down between them without needing anyone else.

What the evidence shows

A Cochrane review pooled 17 trials with 1,466 women. Its findings, in plain terms:

• Overall, there was little difference in pain ratings between TENS and comparison groups.
• Where TENS was added to an epidural, there was no evidence it reduced pain further.
• No adverse events were reported, and TENS did not appear to affect outcomes for mothers or babies either way.
• Most women who used TENS said they would be willing to use it again in a future labor.

The authors concluded there is only limited evidence that TENS reduces labor pain, and that women should have the choice of using it. The NHS reflects the same picture: probably most helpful in the early stages, not shown to be effective in the active phase, and with no known side effects for you or the baby.

Where it fits in a birth plan

TENS works best as one part of a wider plan. ACOG notes that non-medical pain relief approaches can be used alone or alongside medication, and lists relaxation and breathing, massage from a partner, changing positions, a shower or bath if permitted, and warm compresses or ice packs. Ask your care team whether you can use TENS with other options and whether you need to take it off for monitoring, a bath, or a birth pool.

Buying, hiring or borrowing

The NHS notes that some hospitals have TENS machines and that you can hire your own if not. Before you buy:

• Check the labeling. Choose a unit whose instructions say it is intended for use in labor. A general muscle pain unit may not have suitable settings or guidance.
• Check where your birth will happen. Ask whether your hospital or birth center allows personal TENS units.
• Buy pads ahead. Fresh pads stick better. Our guide to TENS unit pads covers what to look for.
• Have batteries or a charge ready before your due date.

Safety in pregnancy

General TENS guidance treats pregnancy as a reason for caution. The NHS TENS page says not to use a TENS machine if you are pregnant unless a doctor or midwife says it is OK. Labor use is a specific exception that your care team should agree to. The NHS also says not to use TENS if you have epilepsy or a pacemaker.

Do not use TENS to manage pain you have not discussed with your midwife or doctor, and the NHS says not to use it in the bath or shower. Abdominal pain in pregnancy needs to be checked, not masked. For safe heat use in pregnancy, see heating pads while pregnant.

What to look for when you buy

Questions people ask

Does a TENS unit work for labor pain?

Evidence is limited. A Cochrane review found little overall difference in pain ratings, but most women said they would use TENS again, and the NHS says it is probably most useful in early labor.

When should I start using TENS in labor?

The NHS suggests it is probably most effective in the early stages, so many people start at home in early labor. Agree the plan with your midwife.

Is TENS safe for the baby?

The NHS says there are no known side effects of TENS for you or the baby, and the Cochrane review reported no adverse events.

Can I use TENS with an epidural?

The Cochrane review found no evidence that TENS reduced pain further when used alongside an epidural. Ask your care team before combining them.

Can I use a TENS unit while pregnant before labor?

Only if your doctor or midwife advises it. The NHS says not to use TENS in pregnancy unless they say it is OK.

Sources

• Pain relief in labour (nhs.uk), NHS
• Transcutaneous electrical nerve stimulation (TENS) for pain management in labour (abstract) (cochranelibrary.com/cdsr/doi/10.1002/14651858.CD007214.pub2/pdf/CDSR/CD007214/CD007214_abstract.pdf), Cochrane Library
• Medications for Pain Relief During Labor and Delivery (acog.org), ACOG
• TENS (transcutaneous electrical nerve stimulation) (nhs.uk), NHS

Sources checked 2026-10-12.