Postpartum Pelvic and Low Back Pain: A Neglected Problem
About 50% of women experience significant pelvic or low back pain in the postpartum period, according to data published in Archives of Gynecology and Obstetrics. In 25% of cases, the pain persists beyond 12 months after delivery. Despite this high prevalence, postpartum pain is often minimized — labeled as "normal" or "transient" — and therapeutic options are limited by the need for safety during breastfeeding.
The principal cause is the action of relaxin — a hormone produced during pregnancy that increases the elasticity of pelvic ligaments to allow passage of the baby during delivery. Relaxin levels remain elevated for 3-6 months after delivery (and longer in breastfeeding women), maintaining ligamentous laxity and pelvic joint instability.
From Relaxin to Trigger Points: The Pain Mechanism
Postpartum pelvic pain cascade
Relaxin and ligamentous laxity
Relaxin increases the compliance of sacroiliac ligaments, the pubic symphysis, and lumbopelvic ligaments. Pelvic joints lose passive stability.
Pelvic girdle instability
Sacroiliac joints and the pubic symphysis become hypermobile. Simple activities such as walking, climbing stairs, or carrying the baby cause repetitive joint microtrauma.
Muscular compensation
Gluteal muscles (maximus, medius, minimus), piriformis, quadratus lumborum, and multifidi over-recruit to compensate for missing ligamentous stability — a job that is not normally theirs.
Postural overload from maternal care
Breastfeeding, carrying the baby, leaning over the crib — asymmetric, sustained postures that overload already fatigued muscles.
Trigger points and chronic pain
Muscular compensation plus postural overload seeds myofascial trigger points in the gluteals, piriformis, quadratus lumborum, and adductors — perpetuating pelvic and low back pain that radiates into the lower limbs.
Muscles and Trigger Points Most Affected Postpartum
TYPICAL POSTPARTUM TRIGGER POINTS
| MUSCLE | WHY IT IS OVERLOADED | REFERRED PAIN | FUNCTIONAL IMPACT |
|---|---|---|---|
| Gluteus medius | Pelvic stabilization during gait | Sacroiliac and lateral hip pain | Difficulty walking and climbing stairs |
| Piriformis | Compensation for sacroiliac instability | Deep gluteal pain radiating to the posterior thigh | Pain when sitting (pseudo-sciatica) |
| Quadratus lumborum | Lumbar stabilization against pelvic laxity | Lateral low back pain with radiation to the iliac crest | Difficulty turning in bed |
| Adductors | Stabilization of the hypermobile pubic symphysis | Inguinal pain and inner thigh pain | Pain when opening the legs (dyspareunia) |
| Rectus abdominis (diastasis) | Postpartum weakness — inability to stabilize the trunk | Suprapubic and low back pain | Difficulty getting out of bed |
| Lumbar multifidi | Segmental stabilization compromised by relaxin | Deep central low back pain | Sensation of spinal instability |
Safety: Drug-Free Treatment During Breastfeeding
A key advantage of medical acupuncture postpartum is the absence of pharmacological risk — there are no exogenous substances transferred into breast milk. During breastfeeding, most analgesics — including commonly used NSAIDs — show some degree of transfer into breast milk. Acupuncture acts predominantly through endogenous neurophysiological mechanisms. As with any needling procedure, possible adverse events exist (hematoma, local pain, vasovagal syncope, rarely infection), although at low frequency.
How Acupuncture Acts on Postpartum Pain
Deactivation of pelvic and lumbar trigger points
Dry needling of trigger points in the gluteals, piriformis, quadratus lumborum, and adductors. The local twitch response restores functional muscle length and reduces compensatory hypertonia.
Endorphinergic analgesia
Low-frequency electroacupuncture (2 Hz) releases beta-endorphins and enkephalins — potent, safe analgesia with no adverse effects for mother or baby.
Possible modulation of the HPA axis and sleep
Sleep deprivation is omnipresent postpartum and amplifies pain. Evidence suggests acupuncture can modulate the hypothalamic-pituitary-adrenal axis, with studies describing lower cortisol and better sleep quality — a clinically relevant indirect benefit.
Support for pelvic recovery
Normalizing pelvic muscle tone supports pelvic floor rehabilitation — reducing incontinence and improving sexual function postpartum.
Postpartum Treatment Protocol
Phases of postpartum treatment
Phase 1
2 sessions/weekImmediate postpartum period (2-6 weeks postpartum)
Focus on acute low back pain and the most painful trigger points. Gentle needling — fewer needles (6-8 points). Side-lying for comfort. Pair with postural guidance for breastfeeding.
Phase 2
1-2 sessions/weekStabilization (6-12 weeks postpartum)
Broader approach — adding gluteals, piriformis, and adductors. Electroacupuncture when indicated. Pair with the start of pelvic stabilization exercises prescribed by the physician.
Phase 3
Biweekly sessionsFunctional recovery (3-6 months)
Maintenance sessions as relaxin levels drop and ligamentous stability returns. Track pelvic floor rehabilitation. Transition to an independent exercise program.
Myths and Facts
Myth vs. Fact
Postpartum low back pain is normal and will go away on its own
Common does not mean inevitable, and it should not be ignored. In 25% of women, the pain persists for more than 12 months. Early treatment with acupuncture prevents chronification and accelerates functional recovery.
I cannot have acupuncture while I am breastfeeding
Acupuncture is a conservative option during breastfeeding precisely because it is drug-free — no substances pass into breast milk. It ranks among the first-line options for treating pain in breastfeeding postpartum women, with individualized indication by the physician.
Diastasis recti is only a cosmetic problem
Diastasis compromises trunk and pelvic stabilization, directly overloading the lumbar and pelvic muscles. It is a biomechanical driver of persistent low back pain and should be addressed as part of the treatment plan.
Postpartum Warning Signs — When to Seek Emergency Care
Frequently Asked Questions
Frequently Asked Questions
Acupuncture can begin in the first weeks after delivery (vaginal or cesarean), provided there are no active postoperative complications. After a cesarean, needling near the scar is avoided for the first 4-6 weeks. The physician decides the ideal timing.
Yes. Many offices are set up to welcome mothers with babies. The session can run with the baby alongside, and breastfeeding during the session does not interfere with treatment.
Yes. Beyond musculoskeletal pain, acupuncture can support scar recovery (after the first weeks), reduce edema, and modulate pain around the incision. The protocol is adjusted to respect surgical healing.
No. There is no evidence that acupuncture reduces milk production. On the contrary, by lowering stress and improving sleep, it may indirectly favor lactation — since elevated cortisol and sleep deprivation both impair milk production.
Insurance coverage for medical acupuncture varies by country and plan. Ask your physician for a referral with the appropriate ICD code (O99.8 or M54.5 for postpartum low back pain) and a clinical report. The number of authorized sessions varies by carrier.