Evidence behind this recommendation.
Selected studies from our library that inform the recommendations on this page. Evidence grade shown when available.
Needling therapies in the management of myofascial trigger point pain: a systematic review
“The systematic review by Cummings and White, a reference in the field, analyzed 23 controlled trials on needling therapies for myofascial trigger points. The results demonstrated that inserting a needle into the trigger point is effective for pain relief, regardless of the substance injected — suggesting that the primary therapeutic mechanism is mechanical (the needle itself), not pharmacological.”
Dry needling versus acupuncture in the treatment of myofascial pain: a systematic review and meta-analysis
“Meta-analysis comparing dry needling and acupuncture in the treatment of myofascial pain demonstrated that both approaches are effective in reducing pain intensity (SMD −1.42; 95% CI) and in improving the pressure pain threshold of trigger points, with statistical superiority of electroacupuncture over simple dry needling for chronic pain.”
What Is Myofascial Pain Syndrome?
Myofascial pain syndrome (MPS) is the most common cause of chronic musculoskeletal pain in pain clinics worldwide. It is characterized by the presence of myofascial trigger points — palpable hypersensitive nodules within taut bands of skeletal muscle that produce local pain and, primarily, referred pain at a distance in predictable and reproducible patterns.
Unlike fibromyalgia (which involves diffuse central sensitization), MPS is a primarily peripheral condition: the source of pain is in the muscle itself, in the trigger points. Each muscle has referred pain patterns mapped by Travell and Simons since the 1950s — maps that remain the clinical reference today.
Medical acupuncture, especially in the dry needling modality, is considered one of the interventions of choice for myofascial trigger points, with consistent support in systematic reviews and meta-analyses published in high-impact journals.
MYOFASCIAL PAIN SYNDROME IN NUMBERS
Trigger Points
Palpable nodules in taut muscle bands that generate predictable referred pain — the hallmark of MPS.
Referred Pain
Reproducible patterns of pain at a distance (e.g., upper trapezius → temporal headache; piriformis → leg pain).
Trigger Point Needling
Systematic reviews indicate consistent benefit of trigger point needling compared to controls, supporting its use in clinical protocols.
Why Are Conventional Treatments Not Always Sufficient?
Pharmacological treatment of MPS is based on analgesics, muscle relaxants, and anti-inflammatories. Although useful for temporary relief, these medications do not address the central cause of the problem: the active myofascial trigger point. The contractile nodule persists, the taut band remains, and referred pain returns when the pharmacological effect wears off.
Local anesthetic infiltrations (lidocaine) are widely used, but the systematic review by Cummings and White (2001) suggested that needle insertion — more than the substance injected — would be the main therapeutic component. Subsequent studies maintain this argument, making dry needling a reasonable alternative to needling with infiltration, with a distinct safety profile.
COMPARISON: PHARMACOLOGICAL APPROACH VS. MEDICAL ACUPUNCTURE
| ASPECT | PHARMACOLOGICAL | ACUPUNCTURE / NEEDLING |
|---|---|---|
| Therapeutic target | Symptomatic (pain, inflammation) | Modulates the trigger point and the pain pathway |
| Duration of effect | Hours to days | Weeks to months after a series in some patients |
| Side effects | Gastrointestinal, drowsiness, dependence | Generally mild (hematoma, transient pain); rare AEs reported (pneumothorax, infection) |
| Referred pain | Does not address the referral pattern | May reduce by deactivating the generating trigger point |
| Taut muscle band | Systemic muscle relaxant | Local twitch response (LTR) with sarcomere normalization |
| Long-term use | Significant cumulative risk | Favorable safety profile in trained hands |
How Does Medical Acupuncture Work in Myofascial Pain Syndrome?
Medical acupuncture for MPS works at multiple simultaneous levels: local (at the trigger point), segmental (in the spinal cord), and suprasegmental (in the central nervous system). The most specific mechanism is the local twitch response (LTR), a brief involuntary contraction of the taut band that indicates mechanical deactivation of the trigger point.
Needle electromyography studies demonstrate that the LTR corresponds to depolarization of dysfunctional motor end plates at the trigger point. After the LTR, an immediate drop in spontaneous electrical activity, normalization of sarcomere length, and restoration of local blood flow are observed — reversing the ischemia-contraction cycle that perpetuates the trigger point.
Mechanism of Action of Acupuncture in Myofascial Pain
Needle Insertion at the Trigger Point
The needle penetrates the taut band and reaches the contractile nodule — the locus of the trigger point. The microlocal mechanical lesion disrupts the shortened actin-myosin filaments.
Local Twitch Response (LTR)
The LTR indicates depolarization of dysfunctional motor end plates. The shortened sarcomere normalizes, local blood flow is restored, and tissue ischemia is reversed.
Release of Endogenous Opioids
Stimulation of Aδ fibers by the needle activates the descending inhibitory system: release of enkephalins and β-endorphins in the dorsal horn of the spinal cord (corresponding segments).
Reduction of Pain Mediators
After needling, a measurable reduction in substance P, CGRP, bradykinin, and serotonin in the interstitial milieu of the trigger point occurs — demonstrated by in vivo microdialysis (Shah et al., 2005).
Modulation of Central Sensitization
In chronic MPS, central sensitization amplifies pain. Electroacupuncture at 2 Hz reduces hyperexcitability of dorsal horn neurons, normalizing the expanded receptive fields.
Scientific Evidence
Acupuncture for myofascial pain is one of the applications with the most consolidated evidence base in integrative medicine. Systematic reviews, meta-analyses in high-impact journals, and international clinical guidelines support its use as an adjuvant intervention in the management of myofascial pain.
CLINICAL OUTCOMES IN CONTROLLED TRIALS
Modern Approach and Clinical Protocols
Modern treatment of MPS by medical acupuncture combines deep dry needling of trigger points with electroacupuncture and post-needling stretching protocols. The approach is individualized: the medical acupuncturist identifies active and latent trigger points, prioritizes the primary pain generators, and plans the treatment sequence.
DRY NEEDLING VS. ELECTROACUPUNCTURE FOR TRIGGER POINTS
| ASPECT | DRY NEEDLING | ELECTROACUPUNCTURE |
|---|---|---|
| Primary mechanism | Mechanical — LTR and disruption of the nodule | Mechanical + electrical — LTR + neuromodulation |
| Endorphin release | Segmental (enkephalins) | Segmental + suprasegmental (β-endorphins + dynorphins) |
| Ideal for | Acute, superficial trigger points | Chronic MPS, multiple trigger points, central sensitization |
| Electrical frequency | N/A | 2 Hz (endorphins) or 100 Hz (dynorphins) or alternating 2/100 Hz |
| Effect on hyperalgesia | Local and segmental | Local, segmental, and central (PAG-RVM axis) |
Phased Treatment Protocol
Initial Evaluation (session 1)
Mapping of active and latent trigger points, identification of primary generators, assessment of perpetuating factors (posture, ergonomics, stress, nutritional deficiencies — vitamin D, magnesium, iron).
Intensive Phase (sessions 1-6)
Dry needling of active trigger points 2×/week. Goal: deactivate the primary pain generators. Electroacupuncture at 2 Hz for chronic MPS. Immediate post-needling stretching.
Consolidation Phase (sessions 7-10)
Weekly sessions. Needling of latent and satellite trigger points. Correction of perpetuating factors. Reinforcement of the home stretching program.
Maintenance (monthly)
Monthly or bimonthly sessions for recurrence prevention. Monitoring of new trigger points. Maintenance of the range of motion and flexibility achieved.
When to See a Medical Acupuncturist
Myofascial pain syndrome responds excellently to treatment with medical acupuncture, especially when the diagnosis is precise and treatment is started early. Some clinical profiles show a particularly favorable response.
Profiles with Best Response to Treatment
- Chronic musculoskeletal pain (more than 3 months) with identifiable palpable trigger points
- Tension-type headache with a cervical and pericranial myofascial component
- Pain that worsens with sustained posture (computer work, prolonged driving)
- Pain that does not respond adequately to analgesics and anti-inflammatories
- Referred pain in predictable patterns (shoulder pain originating from the trapezius, leg pain originating from the piriformis)
- Patients who wish to reduce the use of medications for chronic pain
Frequently Asked Questions
Frequently Asked Questions
Dry needling and medical acupuncture for trigger points are essentially the same technique when practiced by physicians: insertion of an acupuncture needle directly into the trigger point to deactivate it. The difference is conceptual, not technical. Medical acupuncture may include, in addition to trigger point needling, electrical stimulation (electroacupuncture) and segmental points for spinal modulation.
For acute MPS (less than 3 months), 3-4 sessions may be sufficient. For chronic MPS, an initial series of 6-10 sessions is recommended (2×/week for 3-5 weeks). Most patients perceive significant improvement after 3-4 sessions. Cases with multiple trigger points or uncorrected perpetuating factors may require longer series.
Needle insertion is practically painless. When the needle reaches the active trigger point, the patient feels a brief muscular contraction (local twitch response — LTR) that may be described as a momentary "shock" or "stab". This sensation is expected and desired — it indicates that the trigger point has been reached. After the session, there may be mild local soreness for 24-48 hours (similar to after exercise), which is normal.
Yes, there is evidence that untreated MPS can progress to central sensitization and, eventually, to fibromyalgia in predisposed individuals. Trigger points are peripheral sources of constant nociception that, over time, can sensitize the neurons of the dorsal horn of the spinal cord — a process called wind-up. Treating MPS early can prevent this progression.
Medical acupuncture and physical therapy are complementary, not exclusive. Acupuncture (needling) deactivates the trigger point — it eliminates the source of pain. Stretching and strengthening (guided by the physician or performed in physical therapy) prevent recurrence. The medical acupuncturist coordinates the therapeutic plan and may indicate physical therapy as part of the treatment.
Absolute contraindications include: severe uncontrolled coagulopathy, infection at the puncture site, and allergy to needle metal. Relative contraindications: use of anticoagulants (requires precaution, but is not an absolute contraindication), prior pneumothorax (caution in needling of the trapezius and scalenes), pregnancy (avoid deep needling in the abdomen). The physician evaluates case by case.