Natural vs Medicated Labour: What the Evidence Says About Your Pain Relief Options

The phrase "natural labour" gets used in a lot of different ways, and the ambiguity causes real confusion. To some people it means giving birth without an epidural. To others it means no induction, no continuous monitoring, and no pharmacological intervention of any kind. Understanding which definition is being used matters — because the evidence for and against each approach varies depending on what you are actually comparing.

This article covers what non-medicated labour involves, what medicated labour involves, and what the research actually shows about each option. Neither approach is presented as superior. The goal is to give you accurate information so the decision you make — whether in advance or during labour — is genuinely informed.

Fact-Checked & Transparent: This article is fact-checked against current CDC, WHO, ACOG, and NHS guidelines. All health information is based on authoritative medical sources. Last verified: June 2026.

⚠️ MEDICAL DISCLAIMER

This article is educational information only. It is NOT a substitute for professional medical advice, diagnosis, or treatment.

Always consult your pediatrician or healthcare provider before making any medical decisions for your baby or child. Every baby is unique, and professional medical guidance is essential.

In case of emergency, call 911 or your local emergency number.

What "Natural Labour" Usually Means

In most maternity contexts, natural labour refers to labour without pharmacological pain relief — specifically without an epidural. It does not necessarily mean unmonitored labour, and it does not mean refusing all intervention. A person can labour without an epidural but accept syntocinon to accelerate a slow labour, for example.

Some people also use the term to mean spontaneous onset of labour rather than induced labour. These are two separate things, and it is worth being clear which element you are most interested in.

Why People Choose Non-Medicated Labour

The reasons for wanting to labour without pharmacological pain relief are varied, and all of them are legitimate:

• A desire to remain mobile throughout labour, which is easier without an epidural
• A preference for a faster recovery from birth
• Personal or cultural beliefs about the birthing process
• Previous positive experiences of non-medicated labour
• Concerns about the potential effects of epidural on labour progress or delivery mode
• A wish to feel more involved and in control during the process

Choosing non-medicated labour is a valid preference. So is choosing an epidural. The important thing is that the decision is based on accurate information rather than social pressure in either direction.

Non-Pharmacological Pain Relief Options

Water and Birthing Pools

Immersion in warm water is one of the most effective non-pharmacological pain relief options available. The Cochrane review on immersion in water during labour found that it significantly reduces the perception of pain and reduces requests for epidural anaesthesia. The NHS supports water birth for low-risk pregnancies and most midwife-led units have pools available.

Water works particularly well in established labour. It relaxes muscles, reduces the sensation of contractions through hydrostatic pressure, and allows easier position changes. If a pool is important to you, ask your birth unit whether one is available and what would require you to leave it.

Hypnobirthing and Breathing Techniques

Hypnobirthing encompasses a range of techniques including deep breathing, visualisation, progressive muscle relaxation, and reframing language around birth (using words like "surge" rather than "contraction"). The evidence base for hypnobirthing is growing but remains mixed — some studies show reduced anxiety and pain perception, while others show more modest effects.

What the evidence does consistently support is controlled breathing as a pain management tool. Slow, rhythmic breathing during contractions reduces the perception of pain and gives a person something to focus on. It costs nothing, requires no equipment, and can be used alongside any other form of pain relief.

TENS Machine

Transcutaneous electrical nerve stimulation (TENS) delivers small electrical pulses through pads placed on the lower back. It is thought to work in two ways: by stimulating the release of endorphins, and by interfering with pain signals travelling to the brain (the gate control theory of pain).

TENS is most effective in early labour when contractions are building. The NHS considers it safe to use in labour. It becomes less useful as labour intensifies because the current cannot be increased indefinitely. Many women hire or buy TENS machines to use at home in early labour, then move to other methods when active labour begins. It has no effect on the baby and wears off immediately when switched off.

Massage and Counterpressure

Firm pressure applied to the lower back during contractions — particularly sacral pressure — is consistently reported as helpful for back labour, where contractions are felt primarily in the lower back rather than the abdomen. This often occurs when the baby is in an occiput posterior position (back-to-back).

Massage between contractions can reduce overall muscle tension and support relaxation. A birth partner can be taught basic techniques in antenatal classes, and many midwives will also provide guidance during labour.

Sterile Water Injections

Sterile water injections are a lesser-known option specifically effective for back labour. Small amounts of sterile water are injected intradermally at four points on the lower back, producing a sharp stinging sensation that rapidly gives way to significant relief from back pain lasting 45–90 minutes. The mechanism is not entirely understood but likely involves the same gate control mechanism as TENS.

The evidence for sterile water injections is reasonably strong for back pain specifically, and they are safe for the baby. They are not available at all units, so it is worth asking in advance whether your birth setting offers them.

Movement and Position Changes

Upright positions — standing, walking, sitting on a birthing ball, kneeling on all fours — use gravity to help the baby descend and often reduce the duration of first stage labour. The Royal College of Midwives encourages active labour and regular position changes.

Moving between positions also helps manage pain by changing the pattern of pressure felt during contractions. Many people find that a position that works well for one hour becomes less effective as labour progresses, and changing positions restores some relief.

Pharmacological Pain Relief Options

Entonox (Gas and Air)

Entonox is a 50:50 mixture of oxygen and nitrous oxide, inhaled through a mouthpiece or mask during contractions. It is the most widely used pain relief in UK labour wards and midwife-led units. It does not eliminate pain but blunts the intensity and gives a person something to focus on.

Key facts about Entonox:

• It takes about 30 seconds to work, so you need to start breathing it at the beginning of a contraction
• Effects wear off within seconds of stopping — you can put the mouthpiece down between contractions and feel clear-headed
• It does not cross the placenta in significant amounts and does not affect the baby
• Common side effects are dizziness and nausea
• It can be used in the pool
• It is compatible with all other forms of pain relief

Pethidine and Diamorphine

Opioid injections — most commonly pethidine or diamorphine depending on the unit — are given intramuscularly and take effect within 20–30 minutes. They cause drowsiness and can help a person rest during a long early labour. They do not eliminate pain but may reduce the perception of it.

Important considerations:

• Opioids cross the placenta and can cause drowsiness and breathing difficulties in the newborn if given too close to delivery. For this reason, they are generally not given when delivery is thought to be imminent — usually within four hours of the expected birth.
• If the baby is affected, a drug called naloxone can reverse the effect.
• Many people experience nausea with pethidine, and an antiemetic is usually offered alongside it.
• Some people find opioid injections less effective than expected and request an epidural afterwards.

Epidural

An epidural is the most effective form of pain relief available in labour. It involves a fine catheter placed in the epidural space of the lower spine, through which local anaesthetic and usually an opioid are delivered continuously or on demand. Epidurals are placed by an anaesthetist and take approximately 20–30 minutes to set up and become effective.

What a standard epidural involves:

• You will need to remain still for the insertion, which takes about 10 minutes
• A drip (IV access) is required
• Blood pressure is monitored more frequently after placement because epidurals can cause a temporary drop in blood pressure
• Bladder sensation is reduced, so a urinary catheter is usually inserted
• Leg sensation and movement are reduced, limiting mobility (though this varies)

Mobile epidurals and combined spinal-epidurals (CSE):

Some units offer mobile epidurals or CSE, which use lower doses of anaesthetic and allow for greater sensation and the possibility of some mobility. These require a higher level of anaesthetic expertise and are not available everywhere.

What the evidence shows:

• Epidurals provide significantly better pain relief than any other option
• They are associated with a longer second stage of labour
• They are associated with a higher rate of instrumental delivery (forceps or ventouse) — the Cochrane review of epidural anaesthesia in labour found this association to be robust
• They are not associated with long-term back pain — this is a persistent myth; the NHS explicitly states that epidurals do not cause long-term back problems
• Dural puncture headache, caused by accidental puncture of the dura, occurs in approximately 1 in 100 epidurals and causes a severe positional headache that requires treatment
• Serious complications from epidurals are rare

Epidurals and caesarean rates:

Despite concern that epidurals increase the risk of emergency caesarean section, the evidence does not support this. The Cochrane review found no significant increase in caesarean rates with epidural use.

Making the Decision

No approach to labour pain relief is objectively better than another. The right choice depends on your specific situation, your values, your previous experiences, and — most importantly — how you feel on the day.

A few evidence-based observations that may help:

• Having a plan is useful, but holding that plan loosely is more useful. Many people who plan non-medicated labours choose an epidural during labour — and many people who plan epidurals find they do not need one.
• If you want to try to avoid an epidural, learning non-pharmacological techniques in advance (breathing, hypnobirthing, TENS use) increases the likelihood that they will help when you need them.
• If you feel strongly about an epidural, you can request one when you arrive in established labour. There is no window after which you cannot have one, though very late in second stage an anaesthetist may advise it is not appropriate.
• Your birth partner's support has a measurable effect on pain management. Studies consistently show that continuous support during labour reduces requests for pain relief and improves birth experiences. This is something you can prepare for regardless of which approach you choose.

Frequently Asked Questions

Can I start with non-medicated labour and switch to an epidural?

Yes. You can request an epidural at any point during labour. Many people begin with non-pharmacological methods and request an epidural when labour intensifies. This is a completely normal pattern, and switching is not a failure of any kind.

Does an epidural slow down labour?

Epidurals are associated with a longer second stage (the pushing phase). The first stage does not appear to be significantly prolonged. An oxytocin drip is sometimes used to help contractions continue effectively after an epidural is placed.

Is gas and air safe for the baby?

Yes. Entonox has a very short half-life and does not accumulate in the blood. It clears from the body within seconds of stopping inhalation and has no clinically significant effect on the baby.

Do epidurals cause long-term back pain?

No. This is a common concern that the evidence does not support. The NHS specifically states that epidurals are not associated with long-term back problems. Back pain after birth is very common regardless of how pain was managed in labour, usually due to the physical demands of pregnancy and the birth position.

What is a TENS machine and when should I start using it?

A TENS machine is a small device that delivers electrical pulses to the lower back through adhesive pads. It is most effective when started in early labour as contractions begin to build. It is available to hire or buy, and many midwife-led units will have them available. Start using it before contractions become very strong for the best effect.

What happens if I want an epidural and there is no anaesthetist available immediately?

In NHS hospitals, an anaesthetist is available 24 hours a day for emergency procedures, but there may be a wait for an elective epidural during busy periods. Entonox can be used in the interim. If this concerns you, it is worth discussing with your midwife team in advance.

Key Takeaways

• "Natural labour" most commonly refers to labour without an epidural, though the term is used loosely — be clear about which element matters to you.
• Water immersion, TENS, breathing techniques, and sterile water injections are all evidence-supported non-pharmacological options.
• Entonox is safe, fast-acting, and has no effect on the baby — it is the most widely used labour pain relief in the UK.
• Epidurals provide the most effective pain relief in labour and are not associated with increased caesarean rates or long-term back pain.
• Epidurals are associated with a longer second stage and a higher rate of instrumental delivery.
• Making a plan is helpful, but being willing to adjust that plan during labour leads to better experiences — whatever path labour takes.

📋 SOURCES & FACT-CHECKING

This article is compiled and verified against these authoritative sources: - CDC (Centers for Disease Control & Prevention) - WHO (World Health Organization) - ACOG (American College of Obstetricians and Gynecologists) - NHS (National Health Service) - AAP (American Academy of Pediatrics)

Last verified: June 2026

Educational content only. Always consult your pediatrician for medical decisions.

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