§ 01

What Are Trigger Point Injections?

Trigger Point Injections Treatment

Trigger Point Injections Treatment

Overview Diagram

Trigger point injections involve clinician-directed needle treatment of myofascial trigger points using a selected injectate. In practice, the procedure is used when a direct local intervention is needed and when more conservative approaches have not been enough or are not appropriate on their own.

The therapeutic effect may come from more than one source: the needle itself, the local medication effect, the immediate reduction in pain, and the opportunity to follow the procedure with movement or rehabilitation. The exact balance of those effects remains debated.

A useful response means easier daily activity as well as pain relief; repeat treatment depends on that response.

Some patients report short-term relief that can make movement or rehabilitation easier for a while. In a neck and shoulder trial, however, adding lidocaine injection to physical therapy did not improve pain more than physical therapy alone (PMID 26911981).

§ 02

Types of Injectables

Local Anesthetics

Clinician-selected local anesthetic

Local anesthetic is often used to provide short-term pain relief and make the treated area less reactive immediately after the procedure. The exact balance between needle effect and medication effect remains debated, but immediate symptom reduction is one reason this option is used.

  • Can provide short-term pain relief
  • May reduce local pain enough to allow follow-up movement or stretching
  • Commonly used in routine trigger point practice
  • Generally familiar to pain and rehabilitation clinicians

Corticosteroid Addition Is Usually Unnecessary

Local anesthetic alone should be considered

A multisociety guideline led by ASRA Pain Medicine found minimal benefit from adding a corticosteroid to trigger-point injections (Benzon et al.; PMID 39019502), and steroid exposure carries its own risks. Persistent pain after a prior injection calls for reassessment; it does not establish an inflammatory indication for steroid.

  • Minimal added benefit over local anesthetic alone
  • Persistent symptoms require a review of diagnosis and treatment goals
  • An unsuccessful earlier injection does not justify steroid escalation
  • Joint, bursal and nerve injections follow their own condition-specific evidence

Normal Saline

Isotonic saline

Saline is sometimes used when the clinician wants to rely mainly on the mechanical needle effect and local fluid distribution rather than on a pharmacologically active local anesthetic.

  • Avoids local anesthetic exposure
  • Supports the idea that the needle effect itself may be important
  • May be useful when a simpler injectate is preferred
  • Avoids some medication-specific concerns

Botulinum Toxin

Botulinum toxin in selected cases

Botulinum toxin may be discussed for selected persistent conditions such as assessed piriformis syndrome, where a 56-person trial favored incobotulinumtoxinA plus physical therapy over saline plus physical therapy (Fishman et al., 2017; PMID 27935076). Neck and jaw trials disagree. Its muscle effects can persist without useful pain relief, so it does not have a universal duration advantage over local anesthetic.

  • Pain-relief duration depends on diagnosis and response
  • Sometimes considered in chronic refractory cases
  • Prior brief relief does not predict toxin benefit
  • Best reserved for carefully selected scenarios

Combination Injections

Clinician-selected combination approach

A combination injectate requires a specific indication supported by evidence. Adding medications has not established a routine advantage for focal muscle pain; avoid treating persistent symptoms as evidence that a stronger mixture is needed.

  • Can be tailored to the clinical situation
  • Each added drug needs its own indication and risk review
  • Useful in selected rather than routine cases
  • Reflects individualized decision-making rather than one-size-fits-all care
§ 03

Mechanism of Action

Mechanism of Action

Mechanism of Action

Mechanism Diagram

Mechanical Effects

  • Local needle stimulation may disrupt trigger point irritability
  • The procedure may reduce local guarding in a targeted region
  • Familiar pain during needle placement is an observation, not confirmation of the diagnosis
  • A useful short-term treatment window may follow the procedure

Pharmacological Effects

  • A local anesthetic may provide short-term symptom reduction
  • Selected injectates may change local tissue irritability in different ways
  • Medication choice depends on clinician judgment and the presentation
  • The injectate should support the treatment goal, not replace diagnosis
§ 04

The Procedure

The Procedure

The Procedure

Step-by-Step Illustration

Clinical Identification

The clinician identifies the suspected trigger point region through history, palpation, pain-pattern correlation, and overall clinical reasoning. The goal is to choose a target that is genuinely relevant to the patient’s symptoms.

Preparation and Safety Check

The area is prepared using appropriate infection-control measures, and the clinician confirms that the planned target and injectate remain appropriate for the patient’s medical context.

Needle Placement

The needle is placed into the intended trigger point region using clinician judgment, anatomical knowledge, and — when appropriate — imaging or other safety strategies.

Confirmation of Relevant Response

The clinician watches for a useful response, such as familiar symptom reproduction, reduced local reactivity, or other procedural feedback that supports correct targeting. The exact cues vary by region and operator.

Injection

A small amount of clinician-selected injectate may be delivered into the region if the procedure is proceeding as intended. The exact substance and volume should remain under clinician control rather than be treated as a generic recipe.

Immediate Reassessment

After treatment, the area is reassessed for pain, movement, irritability, and whether the procedure created a useful short-term window for further therapy.
§ 05

What to Expect

During Treatment

  • A brief sharp sensation may be felt during needle placement
  • The familiar pain pattern may be momentarily reproduced
  • A local twitch or local response may occur in some cases
  • The experience varies depending on the muscle, region, and injectate used

After Treatment

  • Short-term soreness is common after the procedure
  • The next step is usually guided movement, stretching, or rehabilitation rather than complete inactivity
  • The response should be judged by symptom change and function over time, not just by the procedure itself
  • Unexpected worsening or signs of complication require follow-up
§ 06

Evidence by Condition

Focal Upper-Trapezius Myofascial Pain

Lidocaine may offer faster immediate relief than saline injection, without a demonstrated advantage at 2–4 weeks (PMID 34179755). Define a functional goal and consider active-care alternatives.

Assessed Persistent Piriformis Syndrome

A local-anesthetic injection may be discussed after a regional hip/back/nerve assessment. A small responder-selected trial found no additional steroid benefit through three months (PMID 25794202).

Chronic Axial Neck or Back Pain

The 2025 BMJ guideline strongly recommends against intramuscular local-anesthetic injections with or without steroid for this chronic non-cancer, non-inflammatory spine-pain population (PMID 39971339). Persistent tenderness does not justify routine escalation.

Chronic Painful TMD

The 2023 chronic-TMD guideline conditionally recommends against routine trigger-point injection and botulinum toxin (PMID 38101929). An exceptional specialist discussion must address uncertain benefit and effects on eating and jaw function.

Headache With Neck or Temple Tenderness

Establish the headache diagnosis. Tenderness alone does not establish an injection indication; migraine prevention, cervicogenic headache and tension-type headache follow different evidence and treatment pathways.

Persistent Pain After an Earlier Procedure

Reassess the diagnosis, activity limitation and duration of benefit before another injection. Failure of a simpler procedure does not identify a steroid-responsive inflammatory condition or predict botulinum-toxin benefit.
§ 07

Evidence Base

Condition-specific, variable benefitCompare pain, function and follow-up

A local-anesthetic injection may provide short-term relief in selected focal muscle pain. In an 80-person upper-trapezius trial (Tantanatip et al., 2021; PMID 34179755), lidocaine TPI relieved pain faster than saline interfascial injection at 10 minutes but had no advantage at 2 or 4 weeks. Injection planes and techniques also differed.

Lugo et al. (2016; PMID 26911981) compared physiotherapy, lidocaine injection and both in 127 people with neck/shoulder MPS and found no additional pain benefit from combining them at 1 or 3 months. For chronic axial neck/back pain, the 2025 BMJ guideline strongly recommends against intramuscular local-anesthetic injections with or without steroid (Busse et al.; PMID 39971339).

For piriformis syndrome, a small 2015 trial randomized 50 patients and analyzed the 47 whose pain fell by at least half after the injection; adding steroid gave no extra benefit at 1 week, 1 month or 3 months (Misirlioglu et al.; PMID 25794202). It lacked sham and used response-based diagnostic selection. For chronic painful TMD, the 2023 BMJ guideline conditionally recommends against routine TPI and toxin (Busse et al.; PMID 38101929).

§ 08

Choosing Between Injection and Dry Needling

A short-term analgesic goal

Discuss whether immediate numbing is useful for the assessed condition. This does not establish superior lasting pain relief or function compared with dry needling.

A diagnosis-specific evidence discussion

Compare options for the actual condition. Upper-trapezius, piriformis and jaw studies involve different populations and do not support one universal procedure sequence.

Medication and procedure preferences

Review allergy, bleeding risk, anatomy and patient preference. An injectate adds medication exposure as well as a needle procedure; more drugs do not necessarily improve the result.

An agreed reassessment point

Record a useful task and baseline symptoms before treatment. If pain relief is absent, brief or unaccompanied by better function, revisit the plan rather than automatically adding sessions.
§ 09

Risks & Complications

Injection Types & Clinical Roles
Local Anesthetic

Often used when short-term pain reduction is desired after a clearly targeted trigger point procedure.

Needle Effect

A substantial part of the benefit may come from local needle stimulation rather than the injectate alone.

Avoid Routine Steroid Addition

A multisociety guideline found minimal benefit from adding corticosteroid to trigger-point injection.

Botulinum Toxin

Reserved for selected refractory presentations rather than routine first-line use.

§ 10

Follow-Up & Treatment Course

Variable

Typical Treatment CourseAgree on one treatment goal and a review point before deciding whether further procedures are worthwhile

Rehabilitation Matters

Continue a suitable movement and rehabilitation plan; an injection does not establish which exercise or stretch is appropriate

Combine With a Broader Plan

Rehabilitation addresses activity limitations. Adding injection to physiotherapy has not consistently improved pain more than physiotherapy alone