Overview
This page covers trigger point therapy, a term used for several techniques directed at myofascial trigger points, which clinicians describe as tender nodules within taut bands of skeletal muscle. It follows the concept from the work of Janet Travell and David Simons, sets out how manual pressure, dry needling and injection differ, and reports what systematic reviews say about identifying trigger points and treating them, including adverse events.
Where does Trigger Point come from?
Early descriptions of painful muscle nodules
A historical review by Shah and colleagues traces descriptions of painful muscle disorders to the sixteenth century, naming Guillaume de Baillou (1538-1616). It reports that in 1816 a British physician, Balfour, linked 'thickenings' and 'nodular tumors' in muscle to pain, that Froriep described muscle callouses in 1843, that Gowers proposed 'fibrositis' in 1904 and that Schade proposed 'myogeloses' in 1919. The review describes the resulting scientific literature as often disjointed, with inconsistent terminology.
Travell, Simons and the trigger point manual
According to the same review, Gutstein, Kelly and Kellgren worked independently in the mid-twentieth century, and Kellgren's injections of hypertonic saline were used to chart zones of referred pain. Janet Travell and Rinzler are credited in the review with coining the term 'myofascial trigger point' in the 1950s, and Simons and Travell published the first edition of Myofascial Pain and Dysfunction: The Trigger Point Manual in 1983. Their early treatments were spray-and-stretch with ethyl chloride and injection of local anaesthetic such as procaine.
From injection to dry needling
The review reports that Sola and Kuitert introduced saline injections in 1955 and that Lewit pioneered dry needling, meaning needling without an injected substance, in 1979, reporting immediate analgesia in nearly 87% of cases. That figure is the review's account of Lewit's report and is not a controlled-trial result. The review also notes interest in acupuncture from the 1970s but states that trigger points and acupuncture points are not the same phenomenon. A separate paper on dry needling safety likewise says that acupuncture and therapeutic dry needling differ in application and proposed mechanisms.
What do the names and terms mean?
Trigger point, taut band and myofascial pain syndrome
Shah and colleagues define myofascial trigger points as hard, discrete, palpable nodules in a taut band of skeletal muscle. An active trigger point is spontaneously painful, while a latent one is painful only on compression. Myofascial pain syndrome is the term for the pain condition involving muscle and surrounding connective tissue. The review notes that Travell and Simons treated trigger points as central to the syndrome and asks whether they are necessary, a question it leaves open. Fernandez-de-las-Penas and Dommerholt describe referred pain as the most characteristic sign.
Trigger point therapy as an umbrella term
The sources reviewed use 'trigger point therapy' loosely for several different procedures: manual techniques such as ischaemic compression, transverse friction massage and counterstrain, needling without injection, and injection of anaesthetic or other agents. Studies sometimes use 'trigger point manual therapy' for the hands-on group and compare it with dry needling. These techniques differ in invasiveness, evidence base and risk, so findings for one cannot be carried over to another.
What does Trigger Point involve?
Locating trigger points by palpation
In the studies reviewed, trigger points are located by manual palpation of a muscle for a taut band, a tender nodule and recognition of the person's familiar pain. A meta-analysis of examiner agreement found that localised tenderness and pain recognition were the criteria that examiners agreed on most often. Shah and colleagues add that a local twitch response, a brief contraction of the muscle fibres, can be elicited, and that no biomarker, imaging or electrodiagnostic criterion is currently accepted for identifying trigger points.
Manual techniques
Manual approaches listed in the historical review include ischaemic compression, transverse friction massage and counterstrain. A systematic review of friction massage for trigger points, mostly in the upper trapezius, notes that the technique places a considerable load on the therapist's hands. The abstracts reviewed for this draft do not give a standard pressure, duration or number of sessions, and trial protocols vary, so no typical dose is stated here.
Needling and injection
A 2024 systematic review defines dry needling as insertion of a solid sterile fine needle through the skin aimed at deactivating myofascial trigger points. Injection techniques place a local anaesthetic or another agent into the muscle. A prospective survey of 420 physical therapists recorded dry needling across 20,464 treatment sessions, which shows that physical therapists deliver it in at least some settings. The sources reviewed do not describe a standard session sequence for any technique.
What is Trigger Point used for?
Claims made by clinicians and authors
Travell and Simons held that trigger points are central to myofascial pain syndrome, and the historical review calls spray-and-stretch the workhorse of their approach. In a review article, Fernandez-de-las-Penas and Dommerholt argue that trigger points act as ongoing nociceptive input that can contribute to central sensitisation, and that appropriate treatment may reduce it. These are the authors' interpretations of the literature, offered as hypotheses, and not settled findings.
Conditions in which the techniques have been studied
Reviews of trigger point techniques address neck and upper back myofascial pain, neck pain symptoms associated with trigger points, head, neck and shoulder myofascial pain, orofacial pain and upper trapezius trigger points. Other uses sometimes listed for the techniques, such as migraine or fibromyalgia, were not examined in the sources reviewed for this draft and are not endorsed here.
What does the research show?
Can trigger points be identified reliably?
A 2017 systematic review and meta-analysis of manual palpation searched MEDLINE and Embase from 2007 and drew on two earlier reviews for older work. Six of 18 potentially relevant studies, with 363 patients, were included. Pooled interrater agreement was moderate (kappa 0.452, 95% confidence interval 0.364 to 0.540), and the authors concluded that palpation is unreliable on its own. A 2018 study in Toledo, Spain, with 20 patients and 20 healthy controls examined by two experienced examiners reported very good agreement (kappa 1.0 for classifying people, 0.81 for muscles). That sample was small and the examiners were expert, so the two findings are not directly comparable.
Manual techniques compared with needling
A 2019 systematic review found eight studies of manual therapy, 23 of dry needling and two of dry cupping for myofascial pain, and judged the evidence for manual therapy moderate and that for dry needling very low to moderate. It cited unclear methods, high risk of bias, poor blinding and small samples. A 2020 meta-analysis of six trials with 241 participants with neck and upper back pain found no significant difference between dry needling and manual trigger point therapy for pain (standardised difference 0.41, interval -0.18 to 0.99), pressure pain threshold or disability. A 2025 review of friction massage in 12 studies found within-group improvements but no significant superiority over controls for pain or pressure pain threshold, and graded the evidence level C.
Dry needling and injection
A 2020 meta-analysis of 28 trials of dry needling for trigger points with neck pain reported lower pain than sham, placebo, waiting list or other forms of dry needling immediately after treatment (mean difference -1.53 points) and at short term (-2.31), and a smaller short-term difference against manual therapy (-0.51). It rated the evidence low to moderate and found no between-treatment effect at mid-term. A 2024 review of 24 trials in orofacial pain found very low-certainty evidence of no effect on pain intensity up to six weeks. A 2019 review of 15 trials found local anaesthetic injection reduced pain more than dry needling at one to four weeks, but not when only double-blinded studies were analysed; the evidence was low quality.
What are the criticisms and limits?
A contested construct
Shah and colleagues state that there are no accepted criteria for identifying or quantitatively describing trigger points, and that the lack of consistent nomenclature, diagnostic criteria and objective assessment has produced controversy. They cite a survey in which 57 of 93 papers referenced the Trigger Point Manual but only 12 used its criteria correctly, and they describe the integrated trigger point hypothesis as conjectural. Fernandez-de-las-Penas and Dommerholt note continuing debate over whether trigger points are a peripheral or a central nervous system phenomenon.
Limits of the trial evidence
The reviews above repeatedly report small trials, unclear methods, high or unclear risk of bias and limited blinding, which matters because needling and manual techniques are hard to mask from participants and from the person delivering them. Heterogeneity in comparators, muscles, doses and follow-up also limits pooling. Most reviews cover short follow-up, so longer-term outcomes are largely unknown from the sources reviewed.
What are the safety considerations?
Adverse events with dry needling
In the prospective survey of 420 physical therapists, minor adverse events followed 36.7% of dry needling treatments: bleeding 16%, bruising 7.7% and pain during needling 5.9%. Twenty major events were reported, below 0.1% of treatments or about one per 1,024, and none was linked to practitioner training level. Data were self-reported by therapists over six weeks, and the abstract does not say how many major events were pneumothorax, so rarity should not be read as safety.
Serious complications in case reports
An emergency department in Melbourne reported three cases of traumatic pneumothorax after acupuncture or dry needling between 2014 and 2016. A 2024 case report describes a 35-year-old woman with sharp pain under the scapula during a session, with pneumothorax confirmed three days later. A 2016 case report describes a deep spinal infection in a 15-year-old with spinal instrumentation after dry needling of the periscapular region. Case reports show that these events can occur and say nothing about their frequency.
Suitability, training and care boundaries
The abstracts opened for manual and injection reviews do not summarise adverse events, so no frequency is stated for them. No statutory regulation or training standard was reviewed for this draft, and requirements differ by country. The case report authors advise that people having needling over the chest wall be told about chest pain or tightness, fatigue and shortness of breath. New, worsening or unexplained pain, or breathing symptoms after needling, should prompt medical assessment, and trigger point therapy does not replace diagnosis.
Connected Entries
Showing 8 of 18 related records.
Classification and context
- Entry type
- Modality
- Practice type
- Manual, needling and injection techniques for muscle pain
- Traditions
- Physical medicine and rehabilitation, Physiotherapy, Manual therapy
- Concepts
- Myofascial trigger point, Taut band, Referred pain, Local twitch response, Myofascial pain syndrome, Active and latent trigger points, Peripheral and central sensitisation
- Categories
- Holistic, Complementary
Sources and discovery context
Research and public-health sources support evidence and safety context. Directory and discovery sources describe navigation, relationships, practitioners, and access—not clinical efficacy.
A review tracing the trigger point concept from early muscle-pain descriptions to modern imaging and biochemical work.
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- Supports dates, terminology and the statement that criteria and pathophysiology are unsettled. Must not be read as showing that trigger point treatments work. Authors include NIH-affiliated investigators who have published on trigger points.
- Supports sections
- History and Origins, Terminology, Practice Description, Claimed Uses, Research and Evidence
A narrative review of whether trigger points reflect peripheral or central nervous system processes.
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- Exact source page
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- Supports the statement that peripheral versus central origin is debated and that the authors hypothesise central sensitisation. Must not be read as demonstrating treatment benefit.
- Supports sections
- Terminology, Claimed Uses, Research and Evidence
A meta-analysis of six studies of agreement between examiners palpating for trigger points.
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- Supports pooled kappa and criteria agreement. Does not address whether treatment helps or whether trigger points are a valid construct.
- Supports sections
- Practice Description, Research and Evidence
A study of agreement between two experienced examiners identifying myofascial pain syndrome.
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- Small single-centre study (20 patients, 20 controls) with experienced examiners; must not be generalised to routine practice.
- Supports sections
- Research and Evidence
A short-term review comparing manual therapy, dry needling and dry cupping for myofascial pain.
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- Short-term outcomes only; methodology is weaker than a Cochrane-type review. Do not infer effects for individual conditions.
- Supports sections
- Terminology, Research and Evidence
A meta-analysis comparing dry needling with trigger point manual therapy for neck and upper back pain.
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- Six trials, 241 participants, neck and upper back only. Non-significant differences do not show equivalence.
- Supports sections
- Terminology, Claimed Uses, Research and Evidence
A 28-trial review of dry needling against sham, other needling forms and other interventions.
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- Neck pain with trigger points only; GRADE low to moderate; no between-treatment effect at mid-term.
- Supports sections
- Claimed Uses, Research and Evidence
A review of 24 trials of dry needling for orofacial pain.
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- Orofacial pain (headache types excluded); very low to low certainty. Not transferable to other regions.
- Supports sections
- Practice Description, Claimed Uses, Research and Evidence
A review of 12 trials of friction massage on trigger points.
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- Exact source page
- Relationship
- Friction massage only, chiefly upper trapezius; level C evidence. Does not cover other manual techniques.
- Supports sections
- Practice Description, Claimed Uses, Research and Evidence
A review of 15 trials of local anaesthetic trigger point injection.
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- Local anaesthetic injection in head, neck and shoulder only; low quality; difference lost in double-blinded studies.
- Supports sections
- Terminology, Practice Description, Claimed Uses, Research and Evidence
A six-week survey of 420 physical therapists recording adverse events after dry needling.
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- Therapist self-report over six weeks; not a complication registry. Must not be read as proof of low risk.
- Supports sections
- History and Origins, Practice Description, Safety and Suitability
A report of three traumatic pneumothoraces after acupuncture or dry needling seen in one emergency department.
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- Three cases; says nothing about frequency or about which technique was used in each.
- Supports sections
- Safety and Suitability
A case of pneumothorax confirmed three days after dry needling for chronic myofascial pain.
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- One patient; shows the event can occur, not how often.
- Supports sections
- Safety and Suitability
A report of deep spinal infection after dry needling in a patient with spinal instrumentation.
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- One adolescent patient with spinal instrumentation; not a rate.
- Supports sections
- Safety and Suitability
Links to Gyfts Trigger Point page for this practice, for discovery only. The platform's descriptions and claims are not independent claims. Machipedia does not rely on them for evidence.
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- Links to Gyfts' page for this practice, for discovery only. The platform's descriptions and claims are not independent evidence, and nothing on this Machipedia page relies on them.
- Supports sections
- Practice Description