Trigger Point Injections: What They Are and When They Help

When Muscle Pain Will Not Release

You have a knot in your upper back that has been there for months. Massage provides temporary relief. Stretching helps briefly. Heat pads give you a few good hours. But the tight, painful spot returns. Always.

That knot has a name: a myofascial trigger point. It is a hyperirritable spot within a taut band of skeletal muscle that produces local pain, referred pain, and muscle dysfunction. When conservative measures have failed to release it, a trigger point injection can break the cycle.

What Trigger Points Are

A trigger point is not just "muscle tension." It is a specific pathophysiological entity:

• A localized contraction knot within muscle fibers
• The affected fibers are in sustained contraction (not relaxation)
• Local circulation is impaired (ischemia)
• Inflammatory mediators and pain chemicals accumulate
• The motor end plate (where nerve meets muscle) is dysfunctional
• This creates a self-perpetuating cycle: contraction → ischemia → pain → more contraction

Trigger points can be:

• Active — currently causing pain, either at the site or referred to a distant location
• Latent — present but not actively painful unless pressed directly

Common Locations

• Upper trapezius — the top of the shoulder, referring pain into the neck and head (tension headache pattern)
• Levator scapulae — between the shoulder blade and neck
• Rhomboids — between the spine and shoulder blade
• Piriformis — deep buttock, can mimic sciatica
• Quadratus lumborum — low back, referring into the hip and buttock
• Suboccipital muscles — base of skull, causing headaches
• Temporalis and masseter — jaw, contributing to TMJ pain

What a Trigger Point Injection Involves

The procedure is straightforward and quick:

1. The provider identifies the trigger point by palpation (you will confirm — "yes, that is the spot")
2. The skin is cleaned
3. A small needle (typically 25-27 gauge) is inserted directly into the trigger point
4. You may feel a "twitch response" — the muscle fasciculates briefly. This is actually a good sign — it confirms the needle is in the trigger point
5. A small amount of solution is injected
6. The needle may be redirected slightly to cover the full extent of the taut band
7. Pressure is applied briefly after removal

The entire procedure takes 5-15 minutes depending on how many points are treated. Multiple trigger points can be addressed in one session.

What Gets Injected

Local Anesthetic Only

Lidocaine (0.5-1%) or bupivacaine (0.25-0.5%) without steroid. This is the most common approach. The anesthetic interrupts the pain cycle and allows the muscle to relax. Some evidence suggests the needle itself (dry needling) is partially responsible for the benefit — the mechanical disruption of the trigger point matters.

Local Anesthetic + Corticosteroid

Adding a small amount of corticosteroid (triamcinolone or dexamethasone) provides anti-inflammatory benefit. Useful when the surrounding tissue is inflamed or when initial injections with anesthetic alone provide only short-term relief.

Dry Needling

Inserting the needle without injecting anything. The mechanical disruption alone can release the trigger point. Growing evidence supports dry needling as equivalent to wet injection for many patients.

Botox (OnabotulinumtoxinA)

For chronic, treatment-resistant trigger points, Botox injections relax the muscle by blocking acetylcholine release at the motor end plate. More expensive but can provide months of relief when other approaches fail.

What to Expect After

Immediately

• The trigger point should feel less painful or resolved
• You may have local soreness at the injection site (like a deep bruise)
• The affected muscle may feel weak or "mushy" for a few hours

First 24-48 Hours

• Soreness at the injection site is common
• Apply ice for 15-20 minutes if sore
• Gentle stretching helps maintain the benefit
• Avoid heavy lifting or intense exercise with the affected muscle

Days to Weeks

• Pain relief may be immediate or develop over several days
• Some patients need a series of injections (2-4) spaced 1-2 weeks apart
• Best results occur when injection is combined with stretching, physical therapy, and addressing the underlying cause

Who Benefits Most

Trigger point injections work best for:

• Myofascial pain syndrome — chronic muscle pain with identifiable trigger points
• Tension headaches — upper trapezius and suboccipital trigger points are frequent contributors
• Chronic neck pain — particularly with defined tender points
• Temporomandibular disorders (TMJ) — masseter and temporalis trigger points
• Fibromyalgia — as a component of multimodal treatment (though evidence is mixed)
• Failed conservative treatment — when stretching, massage, and physical therapy have not resolved the trigger point

Limitations and When They Do Not Work

Trigger point injections are not appropriate for:

• Pain without identifiable trigger points on examination
• Generalized muscle soreness without focal findings
• Pain from nerve compression, joint pathology, or disc disease
• Patients on anticoagulants (relative contraindication — discuss risk/benefit)

They also have limited benefit when the underlying cause is not addressed:

• Poor posture perpetuating muscle strain
• Ergonomic issues at work
• Repetitive movement patterns
• Psychological stress causing chronic muscle guarding
• Sleep position issues

The injection breaks the cycle. But if the cycle's cause remains, the trigger point will recur.

Risks

Trigger point injections are low-risk procedures, but potential complications include:

• Bruising (common, minor)
• Infection (rare with proper technique)
• Pneumothorax (extremely rare, only with injections near the ribcage/upper back — providers trained in anatomy avoid this)
• Allergic reaction to anesthetic (rare)
• Post-injection soreness (common, temporary)
• Vasovagal response (lightheadedness — more anxiety-related than the injection itself)

Combining with Other Treatments

Trigger point injections work best as part of a comprehensive approach:

• Physical therapy — strengthening weak muscles, stretching tight ones, correcting movement patterns
• Ergonomic modification — addressing workplace and sleep positioning
• Stress management — chronic stress perpetuates muscle tension
• Regular movement — deconditioning allows trigger points to form more easily

The injection opens a window of reduced pain. Use that window to do the rehab work that prevents recurrence.

At Coral, we evaluate chronic muscle pain and perform trigger point injections when appropriate as part of a comprehensive pain management approach. [Start your visit](/start) if muscle pain is limiting your life.