TENS vs Gas vs Epidural: Comparing Your Labour Pain Relief Options

Choosing how you'll manage pain in labour is a personal decision, and there's no single right answer. Three of the most common options in Australia are a TENS machine, nitrous oxide (gas) and an epidural. They sit at different points on the scale, from gentle and drug-free through to the strongest relief available. Here's an honest look at how each works, what's good about it, and what to keep in mind. This is general information, not medical advice, so please talk your options through with your midwife or doctor.

A quick word before we compare

Many women use more than one option and change their mind on the day, and that's completely normal. It helps to think of these as tools rather than a single choice you're locked into. The best plan is the one that leaves you feeling informed and supported.

1. TENS machine

How it works

A TENS (transcutaneous electrical nerve stimulation) machine is a small hand-held device connected to sticky pads on your lower back. It sends gentle electrical pulses that are thought to stimulate the nerves and interrupt pain signals travelling to your brain, and may encourage your body's own endorphins. You control the strength yourself, with a boost button for the peak of each contraction.

The upsides

• Completely drug-free, with no known side effects for you or your baby.
• You stay in full control and fully alert.
• Portable and easy to use at home in early labour, and on the way in.
• Can be used on its own or alongside other options.
• Low cost, especially when hired for just the weeks you need it.

Things to know

• It takes the edge off rather than removing pain, and works best when started early.
• It isn't waterproof, so it comes off for a bath, shower or birth pool.
• It's generally not suitable if you have a pacemaker or spinal rods, so check with your midwife first.

What the evidence says

Being honest: the research on TENS for labour is limited and mixed. A large Cochrane review found only limited evidence that it reduces pain overall, though some women using it were less likely to describe their pain as severe, and importantly it showed no harmful effects for mothers or babies. In short, it's low-risk and many women genuinely find it helpful, which is why it remains a popular first comfort measure.

2. Nitrous oxide (gas and air)

How it works

Often just called gas, nitrous oxide is mixed with oxygen and breathed in through a mask or mouthpiece that you hold yourself. You take slow breaths as a contraction builds, and it takes the edge off rather than removing pain completely.

The upsides

• You control it yourself, breath by breath.
• It's short-acting and clears from your system within minutes.
• It doesn't affect your baby and doesn't stop you moving around.
• Easy to start and stop at any point in labour.

Things to know

• It can make some women feel light-headed, a little nauseous or dry in the mouth.
• It reduces pain rather than removing it.
• It isn't suitable for everyone; for example, people with a vitamin B12 deficiency (pernicious anaemia) should check with their midwife or doctor.

3. Epidural

How it works

An epidural is a form of regional pain relief given by an anaesthetist. A fine tube is placed into the space around the nerves in your lower back, and local anaesthetic is given through it to numb you from around the waist down. It can be topped up as needed.

The upsides

• It's the most effective form of pain relief available for labour.
• It can be a wonderful option if you're exhausted or your labour is long or very intense.
• It lets you rest, and the same type of anaesthetic is used if you need a caesarean.

Things to know

• It's a bigger intervention: you'll have a drip, more monitoring of you and your baby, and usually a catheter for your bladder.
• You'll mostly stay on the bed, so you lose some mobility.
• It can lower your blood pressure, and is associated with a longer pushing stage and a higher chance of an assisted (vacuum or forceps) birth.
• It takes around 20 to 30 minutes to place and take effect, and depends on an anaesthetist being available, so it isn't always instant.

At a glance

• TENS: gentle and drug-free, you control it, best for early labour and staying mobile.
• Gas: mild to moderate, self-controlled, wears off fast, keeps you mobile.
• Epidural: the strongest relief, best for long or intense labour, but a bigger intervention with less mobility.

So which should I choose?

You don't have to decide everything in advance. Many women build up as they go: starting with a TENS machine and movement at home, adding gas as things intensify, and keeping an epidural as an option if they want stronger relief later. Others know from the start they'd like an epidural, and that's just as valid. Write a flexible birth plan, talk it through with your care provider, and stay open to how your day unfolds.

Can I use more than one?

Yes. TENS and gas can be used together, and you can move on to an epidural later if you choose. Once you have continuous monitoring or an epidural in place, you'll usually be asked to take the TENS pads off. Your midwife will guide you.

References and further reading

• Pregnancy, Birth and Baby (pain relief during labour)
• healthdirect (pain relief during labour)
• Raising Children Network (pain relief in labour)
• Cochrane review (TENS for pain relief in labour)

Frequently asked questions