Woman resting on a sofa with a heating pad on her lower abdomen for period cramps

Period Pain Relief: Does Heat Really Help Menstrual Cramps?

Short answer: yes, heat helps. The American College of Obstetricians and Gynecologists (ACOG), Mayo Clinic and the NHS all recommend a heating pad, heat wrap or warm bath for menstrual cramps. Warmth relaxes the contracting muscle of the uterus and improves blood flow in the pelvis, and Mayo Clinic notes that for some women heat can be as effective as over-the-counter pain medication. Apply comfortable warmth to the lower abdomen or lower back for 15 to 20 minutes at a time, or wear a low-level heat wrap for longer. Combine it with gentle movement and, if suitable for you, an anti-inflammatory painkiller taken at the first sign of cramps.

What causes period pain?

During a period the lining of the uterus releases prostaglandins, chemicals that make the uterine muscle contract to shed the lining. Higher prostaglandin levels mean stronger contractions and more pain. This is called primary dysmenorrhea. It usually starts a day or so before bleeding, peaks in the first one to two days, and can spread to the lower back and thighs. Some women also get nausea, loose stools or headaches.

Secondary dysmenorrhea is period pain caused by a condition such as endometriosis, fibroids or adenomyosis. It tends to begin later in life, last longer than typical cramps and get worse over time.

How do I use heat for period cramps?

  • Electric heating pad or microwavable pack. Place on the lower abdomen or lower back over clothing for 15 to 20 minutes. Warm, not hot.
  • Wearable heat wrap or heated belt. Low, steady heat you can wear under clothes while you work or move around. Rechargeable belts often add gentle massage.
  • Warm bath or shower. Relaxes the abdominal, back and thigh muscles together.
  • Safety. Never apply heat directly on bare skin at a high setting, do not fall asleep on a heating pad without automatic shut-off, and check your skin regularly. Repeated high heat in the same spot can cause a mottled skin rash.

See our period pain relief collection and heat therapy range.

What else relieves period pain without medication?

  • Exercise. ACOG notes that regular aerobic exercise, such as walking, swimming or cycling, helps reduce period pain. Even a gentle walk on a bad day helps.
  • Gentle stretching and yoga. Child's pose, knees-to-chest and cat-cow ease the lower back and pelvis.
  • Massage. Light circular massage of the lower abdomen.
  • Sleep and stress. Poor sleep and high stress both lower the pain threshold.
  • TENS. Some women find a TENS device helpful. Ask your doctor whether it is suitable for you.

Which painkillers work best for period cramps?

Anti-inflammatory painkillers such as ibuprofen and naproxen reduce prostaglandin production, so they target the cause directly. ACOG advises that they work best when taken at the first sign of your period or pain, and usually only for the first day or two. They are not suitable for everyone, for example people with stomach ulcers, kidney problems, bleeding disorders or aspirin-sensitive asthma, so check with a pharmacist or doctor. Hormonal birth control is another effective option to discuss with your doctor if cramps are severe every month.

When should I see a doctor about period pain?

  • Pain that regularly stops you going to work, school or normal activities.
  • Cramps that are getting worse over time, or that started being severe after age 25.
  • Pain that lasts well beyond the first few days of bleeding, or pelvic pain between periods.
  • Very heavy bleeding, bleeding between periods or pain during sex.
  • Pain that does not respond to heat and over-the-counter painkillers.

Seek urgent care for sudden, severe pelvic pain, especially with fever, fainting or if you could be pregnant.

Key takeaways

  • Heat is a well-supported, drug-free remedy for menstrual cramps.
  • Use comfortable warmth on the lower abdomen or back, 15 to 20 minutes at a time or a low-level wearable wrap.
  • Regular exercise reduces period pain over time.
  • Anti-inflammatories work best taken early, if they are safe for you.
  • Worsening, disabling or unusual pain should be assessed for conditions such as endometriosis or fibroids.

Sources

This article is general wellness information and is not medical advice. It does not replace an examination by a qualified healthcare professional. If your pain is severe, sudden or getting worse, please see a doctor.

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