Trigger Point Injections

Key facts

Who it is for

How a trigger point injection works

A trigger point is a small patch of muscle fibers stuck in contraction. It feels like a firm knot in a tight band, is tender to press, and often sends pain elsewhere: trapezius trigger points refer pain to the temple and behind the eye, gluteal trigger points into the buttock and thigh. The stuck fibers have poor blood flow, which keeps them irritated, and the irritation keeps them contracted.

The injection breaks that loop mechanically and chemically. A thin needle is passed into the knot, often producing a brief local twitch as the fibers release, and a small amount of local anesthetic (lidocaine or bupivacaine, 0.5–2 mL) is injected. The needle itself does much of the work; studies comparing anesthetic injection with "dry needling" (the same needle, no medication) find similar relief, though the anesthetic makes the procedure more comfortable and reduces post-injection soreness. Steroid is sometimes added for a stubborn or inflamed point, but it adds little in most trials and can thin the tissue if repeated, so we use it sparingly.

No imaging is needed. The physician finds the trigger point by hand, and that exam is the whole diagnosis. You do not need to bring MRI or X-ray reports for this procedure, and you do not need a separate procedure-day appointment: trigger point injections are usually done at the visit where they are recommended. We perform them at our Houston and Webster offices, and in Pearland when that office opens in November 2026.

What happens at the visit

1. Exam: the physician presses along the painful muscle to find each trigger point (the tender knot in a tight band that reproduces your pain) and marks it. Usually 1–4 points are treated per session.
2. Positioning: sitting or lying so the muscle is relaxed; for trapezius and upper-back points, lying face down or on your side is used so a faint reaction does not lead to a fall.
3. Skin preparation: the skin is cleaned with alcohol or antiseptic. No numbing injection is needed; the needle is thin.
4. Injection: the physician pinches the muscle between two fingers to lift it away from what lies beneath, inserts the needle into the knot at a shallow angle, and injects a small amount of anesthetic while moving the needle tip through the band. A brief twitch or a reproduction of your usual referred pain is common and is a sign the right spot was found.
5. Pressure and bandage: firm pressure for a minute to limit bruising, then a small bandage. The whole procedure takes about 10 minutes.
6. Home: you may drive yourself. Stretch the treated muscle gently the same day; that is part of the treatment.

After the procedure

Day 0. The area may feel numb or oddly loose for an hour or two from the anesthetic. Gentle range-of-motion stretching of the treated muscle that day helps the release hold. Heat or ice, whichever you prefer, for 15 minutes at a time.

Days 1–2. Soreness or bruising at the injection sites is expected and is often described as feeling like a hard workout. It settles on its own; acetaminophen or an anti-inflammatory helps. Avoid heavy use of the muscle, but keep stretching.

Week 1–2. Relief from the muscle release is established. This is the window to work on the reason the trigger point formed: posture, workstation setup, sleep position, stress, or weakness of the muscles around it. Physical therapy, a home stretching program and, for neck and shoulder points, attention to desk ergonomics are what make the relief last; see physical therapy and home exercise.

Judging the response. A good response is relief of days to weeks with easier stretching. If the same point keeps returning within a week or two despite exercise, or if you have had 2–3 sessions without lasting benefit, we stop injecting and look again at whether a joint, disc or nerve is driving the muscle spasm.

Call us for shortness of breath or sharp chest pain after an injection in the trapezius, shoulder blade or rib-cage area, which could indicate a punctured lung and needs same-day evaluation, or for fever, spreading redness or drainage at the site.

What the evidence shows

Trigger point injections have been used for decades and are supported by many small trials and clinical experience, though the quality of the research is modest. Three findings are consistent. First, needling the trigger point is what matters: systematic reviews (Cummings and White and others) found that injecting local anesthetic, saline or nothing at all (dry needling) produced similar relief, which means the needle's disruption of the contracted fibers is the active ingredient and the anesthetic mainly improves comfort. Second, adding steroid does not improve results over anesthetic alone in most studies. Third, relief is usually short unless the injection is paired with stretching, strengthening and correction of the cause; injections alone rarely produce lasting change.

For fibromyalgia, the picture is different. The tender points of fibromyalgia are not trigger points, injecting them does not help, and the American College of Rheumatology's approach to fibromyalgia centers on exercise, sleep, education and specific medications rather than injections. We say so plainly because it prevents a common disappointment.

Medicare and most commercial insurers cover trigger point injections when trigger points are documented on exam and conservative care has been tried, and they limit frequency (typically a session no more often than every 2 months per site and a few sessions per year) with continued coverage tied to documented improvement.

Alternatives and what comes next

Stretching, heat, massage, physical therapy and a short course of a muscle relaxant treat most trigger points without a needle, and dry needling by a physical therapist is an equivalent alternative for patients who prefer to avoid medication. When trigger points keep returning in the neck and shoulders, the driver is often a cervical facet joint or nerve root; medial branch blocks or a cervical epidural steroid injection address those. Recurrent gluteal or low-back trigger points often sit on top of SI joint or facet pain. For headache from neck and scalp trigger points, an occipital nerve block is sometimes the better match. Persistent, widespread muscle pain is evaluated as a whole rather than point by point; see fibromyalgia and chronic pain.

Safety and preparation

• Blood thinners: trigger point injections are low bleeding-risk procedures and most patients continue aspirin and other blood thinners; expect more bruising. Tell us what you take; a hold is rarely needed and is arranged with your prescriber. Never stop a blood thinner on your own.
• Diabetes: if steroid is added, blood sugar can rise for 1–3 days; anesthetic-only injections do not affect glucose. Tell us if you are diabetic and we will usually omit steroid.
• Infection or fever: we reschedule for fever or a skin problem over the muscle.
• Allergies (contrast, steroid, local anesthetic): tell us about reactions to lidocaine, bupivacaine, dental numbing or cortisone. No contrast is used.
• Pregnancy: no X-ray is involved and the procedure can be done during pregnancy with anesthetic only; tell us so we omit steroid.
• Sedation and driving: no sedation is used and you can drive yourself home.
• Lung disease: tell us if you have emphysema, COPD or a prior collapsed lung, since injections near the rib cage carry a small pneumothorax risk that is higher with overinflated lungs.
• Imaging: none is needed for this procedure; you do not need to bring MRI or X-ray reports unless we are also evaluating a joint or nerve problem.

Risks and side effects

Frequently asked questions

Related care

Related treatments

Related conditions