Pain Relief in Pregnancy: What Is Safe and What to Avoid

Managing pain during pregnancy is more complicated than at any other time in life. Medications that are routinely safe for adults can cross the placenta and affect fetal development. The trimester matters enormously — a drug that carries modest risk in the first trimester may carry very different risks after 20 weeks. And the consequences of untreated pain — disrupted sleep, raised stress hormones, impaired nutrition intake — can themselves affect pregnancy outcomes.

This guide covers what is safe, what to avoid, what to use with caution, and how to manage specific types of pain during pregnancy, drawing on guidance from the NHS, the World Health Organization (WHO), and the National Institute for Health and Care Excellence (NICE).

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.

Why Pregnancy Complicates Pain Management

Pregnancy changes how the body processes drugs. Plasma volume increases by around 40–50%, which affects drug concentrations. The kidneys filter at a higher rate, changing how quickly medications are cleared. And many medications cross the placenta — the organ that was once thought of as a barrier but is now understood to be highly permeable to most small-molecule drugs.

The trimester in which a medication is taken matters significantly:

• First trimester (weeks 1–12): Organogenesis — the development of all major organs — occurs here. Teratogenic medications are most damaging during this window.
• Second trimester (weeks 13–26): Generally considered the safest period for medication use, though risks do not disappear.
• Third trimester (weeks 27–40): Some medications that are relatively safe earlier become problematic as the fetus prepares for birth. This is particularly relevant for NSAIDs.

The principle of using the lowest effective dose for the shortest necessary time applies to all medications in pregnancy.

Paracetamol: The First-Line Analgesic

Paracetamol (acetaminophen) is the pain relief medication recommended by both the NHS and WHO as the first-line analgesic throughout pregnancy. It has been in widespread use for decades and has not been shown to cause birth defects or fetal harm when taken at standard doses.

The standard adult dose is 500 mg to 1 g (one to two standard tablets) taken every four to six hours, with a maximum of 4 g (eight standard 500 mg tablets) per 24 hours. The NHS recommends taking the lowest effective dose for the shortest period necessary.

Recent Research on Paracetamol

In recent years, several observational studies have raised questions about associations between regular paracetamol use in pregnancy and neurodevelopmental outcomes in children — including possible links to ADHD and autism spectrum disorder. These studies have generated headlines but should be interpreted carefully.

Observational studies cannot prove causation. People who take more paracetamol in pregnancy may have more pain or more infection — and pain and infection themselves may independently affect fetal development. The studies also typically look at frequent or prolonged use, not occasional doses.

The NHS reviewed the evidence in 2023 and maintained its guidance that paracetamol remains the recommended first-line painkiller in pregnancy. NICE guidance supports this position. The WHO also endorses paracetamol as safe for use in pregnancy at recommended doses.

The takeaway: paracetamol should be used when you need it, at the lowest effective dose, for the shortest time needed. There is no evidence to support routine avoidance of occasional doses.

Ibuprofen and Other NSAIDs: What You Need to Know

Non-steroidal anti-inflammatory drugs (NSAIDs) — including ibuprofen, naproxen, diclofenac, and aspirin at analgesic doses — are a different matter entirely.

Before 20 Weeks

The NHS advises that ibuprofen should be avoided in the first trimester because some studies associate use with increased risk of miscarriage, though the evidence is not definitive. Before 20 weeks, ibuprofen use is generally not recommended unless there is no suitable alternative and the prescribing clinician has assessed the risk.

From 20 Weeks Onwards

From 20 weeks of pregnancy, NSAIDs are contraindicated. The reason is fetal kidney function: the fetal kidneys begin producing urine from around 16 weeks, and NSAIDs interfere with prostaglandin synthesis in a way that can reduce fetal urine output and amniotic fluid levels (oligohydramnios). In severe cases, this can cause fetal kidney damage.

From 28 weeks, there is an additional risk: NSAIDs can cause premature constriction or closure of the ductus arteriosus — a blood vessel that is essential in fetal circulation and must remain open until after birth. Premature closure can cause serious fetal cardiac complications. The MHRA issued updated guidance in 2023 reinforcing that ibuprofen should not be used from 20 weeks of pregnancy.

This means that if you are past 20 weeks and reach for ibuprofen for a headache or back pain, you need to put it back and use paracetamol instead.

Aspirin in Pregnancy

Aspirin in pregnancy requires a distinction between therapeutic low-dose use and analgesic use.

Low-dose aspirin (75–150 mg daily) is actively prescribed by doctors for specific indications in pregnancy — most importantly for the prevention of pre-eclampsia in high-risk pregnancies. NICE recommends low-dose aspirin from 12 weeks for people with risk factors for pre-eclampsia. At this dose, aspirin is not being used as a painkiller — it is working on platelet function to improve placental blood flow.

Aspirin at analgesic doses (300–900 mg) should not be used for pain relief in pregnancy. At higher doses, aspirin carries the same risks as other NSAIDs, including effects on the ductus arteriosus, and there are also concerns about increased bleeding risk around the time of labour.

If you have been prescribed low-dose aspirin for pre-eclampsia prevention, do not stop it without speaking to your midwife or doctor — it is protecting you. But do not take additional aspirin tablets for headaches or other pain.

Codeine and Opioids

Codeine is a weak opioid that is converted to morphine in the body. Small amounts cross the placenta, and with prolonged use, the newborn can develop signs of opioid withdrawal (neonatal abstinence syndrome). There is also variability in how quickly individuals metabolise codeine — some people convert it to morphine very rapidly, which can lead to higher fetal exposure.

The NHS advises that codeine should be avoided in pregnancy where possible. A GP may consider a brief course for severe pain that has not responded to paracetamol, but this requires careful clinical judgement and should not be a first-line recommendation.

Stronger opioids — tramadol, morphine, oxycodone — should only be used in pregnancy in specific circumstances under medical supervision, with risks and benefits carefully discussed.

Topical Treatments

Some topical pain relief options carry lower systemic risk because absorption through the skin is limited, but pregnancy does not eliminate it entirely.

• Topical NSAIDs (ibuprofen gel, diclofenac gel): Although absorption is much lower than oral use, topical NSAIDs still carry the same theoretical risks from 20 weeks of pregnancy. The NHS recommends checking with a pharmacist or GP before using them.
• Topical muscle rubs containing menthol or camphor in small amounts are generally considered low risk, but check with your pharmacist to confirm the specific product.
• Heat packs and warm compresses: Safe to use. Avoid prolonged high heat to the abdomen.
• Ice packs: Safe for muscle and joint pain.

Managing Specific Types of Pain

Back Pain in Pregnancy

Back pain affects the majority of pregnant people at some point, particularly in the second and third trimesters as the centre of gravity shifts and the ligaments soften under the influence of relaxin.

Safe approaches include:

• Paracetamol at the lowest effective dose
• Physiotherapy — the NHS supports referral to a physiotherapist for pelvic girdle pain (PGP) and lower back pain
• Pregnancy yoga and swimming — low-impact exercise that strengthens the core and back muscles
• Pelvic support belts — safe and often effective for pelvic girdle pain; ask your midwife for a referral or recommendation
• Heat packs on the lower back

Avoid lying flat on your back for prolonged periods in later pregnancy, and focus on posture when sitting. If back pain is severe or radiating down a leg, speak to your GP.

Headaches in Pregnancy

Headaches are very common in the first trimester, often related to hormonal changes, and tend to improve as pregnancy progresses. In later pregnancy, new or severe headaches — particularly those accompanied by visual disturbances, swelling, or high blood pressure — require urgent assessment for pre-eclampsia.

For typical pregnancy headaches:

• Paracetamol is the first-line treatment
• Rest and hydration — dehydration is a common trigger
• Cold or warm compresses to the head or neck

Migraine management changes in pregnancy. Many people find migraines improve during pregnancy. Triptans (such as sumatriptan) are not recommended as a routine choice during pregnancy, though some prescribers may use them in specific circumstances. Discuss migraine management with your GP or neurologist before stopping any preventive treatment.

Dental Pain in Pregnancy

Dental pain can be managed with paracetamol. Dental treatment — including examinations, X-rays with abdominal shielding, fillings, and local anaesthetic injections — is safe throughout pregnancy. Local anaesthetics used in dentistry (such as lidocaine) do not cross the placenta in clinically significant amounts and are safe in all trimesters.

The NHS encourages people to continue routine dental care during pregnancy. Untreated dental infections can carry systemic risks that are more significant than the risks of treatment.

Pelvic Girdle Pain (PGP)

PGP — sometimes called symphysis pubis dysfunction (SPD) — causes pain in the pelvis, hips, and sometimes the inner thighs. It is caused by asymmetric movement in the pelvic joints and affects around 1 in 5 pregnant people to some degree.

Management focuses on:

• Physiotherapy with a pelvic health specialist
• A pelvic support belt
• Modifying activities that aggravate symptoms (such as crossing legs, climbing stairs one leg at a time, carrying heavy loads on one side)
• Paracetamol for pain relief

The Importance of Not Suffering in Silence

Pain in pregnancy is often dismissed or minimised — by others and sometimes by the person experiencing it. Chronic uncontrolled pain disrupts sleep, affects appetite and nutritional intake, raises cortisol levels, and reduces quality of life. None of these outcomes is trivial.

If paracetamol is not controlling your pain and non-pharmacological approaches are not sufficient, speak to your GP. There are options available, and the assessment of risk versus benefit is a clinical conversation — not one you need to manage alone.

Frequently Asked Questions

Is paracetamol completely safe to take every day in pregnancy?

The NHS recommends paracetamol as the first-line painkiller in pregnancy, but at the lowest effective dose for the shortest necessary time. Daily use for weeks at a time is worth discussing with your midwife or GP to ensure the underlying cause of pain is being managed.

Can I take ibuprofen before I knew I was pregnant?

If you took ibuprofen very early in pregnancy before you knew, the risk is low but worth mentioning to your midwife at your booking appointment. They can note it in your records and reassure you based on timing and dose.

Is it safe to take paracetamol in the first trimester?

Yes. Paracetamol is recommended by both the NHS and WHO as safe throughout pregnancy, including the first trimester, at standard doses.

What can I take for a headache at 30 weeks pregnant?

Paracetamol is the appropriate first choice. Ensure you are well hydrated and rested. If the headache is severe, unusual, accompanied by visual disturbances, or not responding to paracetamol, contact your maternity unit or GP promptly — severe headaches in later pregnancy can be a sign of pre-eclampsia.

Are topical pain relief gels safe in pregnancy?

Topical NSAIDs (ibuprofen gel) carry the same cautions as oral NSAIDs from 20 weeks. Other topical products should be checked with a pharmacist. Heat packs and cold compresses are safe alternatives.

What should I do if I need pain relief my GP won't prescribe in pregnancy?

Discuss why you need pain relief and whether the underlying problem can be addressed — for example, physiotherapy for back pain, dental treatment for tooth pain, or a migraine management plan with a neurologist. Untreated pain is itself a risk, and your GP should be working with you to find safe solutions.

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Key Takeaways

• Paracetamol is the recommended first-line painkiller throughout pregnancy, at the lowest effective dose for the shortest necessary time.
• Ibuprofen and other NSAIDs are contraindicated from 20 weeks of pregnancy due to risks of fetal kidney damage and premature closure of the ductus arteriosus.
• Low-dose aspirin prescribed for pre-eclampsia prevention is different from aspirin taken as a painkiller — do not stop prescribed aspirin without speaking to your midwife or doctor.
• Codeine and opioids should be avoided where possible in pregnancy and only used under medical supervision.
• Back pain, headaches, and dental pain can all be managed safely in pregnancy — physiotherapy, rest, and paracetamol are the mainstays.
• If pain is not controlled with paracetamol and lifestyle measures, speak to your GP — there are safe options and you do not have to endure significant pain.

📋 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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