How Often Can You Have Trigger Point Injections?

Most practitioners space trigger point injections somewhere between one and four weeks apart, with a common protocol being once weekly for three to four weeks before reassessing. There is no single universal schedule written into clinical guidelines, because the right frequency depends on the medication injected, how your body responds, and whether you are doing anything between sessions to address the underlying muscle problem. The answer gets more interesting when you look at why spacing matters and what happens when injections are repeated too often or not often enough.

What a Typical Treatment Course Looks Like

A trigger point injection delivers a small amount of local anesthetic, saline, or sometimes a corticosteroid directly into a taut band of muscle that contains a trigger point. In clinical trials and common practice, a series of weekly sessions is the most frequently studied approach. One trial treating noncardiac chest pain, for example, used lidocaine injections into the pectoralis muscles once a week for three weeks alongside a stretching program, and found significant pain reduction that persisted at a three-month follow-up.¹ Another trial studying temporomandibular myofascial pain also used three weekly sessions.²

After an initial series, your provider typically reassesses. If the trigger points have resolved or pain has dropped substantially, you stop. If pain returns weeks or months later, you might do another short course. Some people with chronic, stubborn myofascial pain end up getting injections on an ongoing basis, perhaps monthly, but that raises its own set of concerns about tissue damage that we will get into below.

How Long Does the Relief Actually Last

This is the question that really determines how often you need injections. If one shot gives you three months of relief, you obviously need far fewer sessions than someone whose pain returns in a week. Unfortunately, relief duration varies enormously from person to person and depends on the underlying condition. A study comparing trigger point injection outcomes in myofascial pain patients found significant improvement in pain measures at two weeks post-injection.³ That same study found that patients who also had fibromyalgia did not sustain the improvement as well, highlighting how coexisting conditions shape how long each injection “holds.”

For people with straightforward myofascial pain from a single identifiable trigger point, one to three sessions can sometimes resolve the problem entirely, especially if they pair the injections with stretching and corrective exercise. For more chronic or widespread pain, injections tend to offer shorter windows of relief, and the temptation to repeat them frequently grows. This is where understanding the risks becomes important.

Why Spacing Matters for Your Muscles

Every local anesthetic used in trigger point injections is, to some degree, toxic to muscle tissue. This is not a fringe concern. A review of local anesthetic myotoxicity found that intramuscular injections of these agents regularly produce reversible muscle cell death, and that the extent of damage is dose-dependent and worsens with repeated or continuous administration.⁴ Among the commonly used agents, bupivacaine causes the most severe muscle injury while procaine causes the least. The word “reversible” is doing a lot of work there: in most cases, muscle fibers regenerate over a period of weeks. But if you inject the same spot every few days, you may not give the tissue enough time to heal before damaging it again.

A broader narrative review of local anesthetic cytotoxicity confirmed that the toxic effects on muscle tissue are both time- and concentration-dependent, with the drugs triggering cell death through multiple pathways.⁵ The practical takeaway is that more frequent injections at higher volumes carry a greater risk of cumulative muscle damage. This is a key reason most providers space sessions at least a week apart and limit the total number of injections into any single trigger point within a given period.

The Steroid Question

Some providers add a corticosteroid to the local anesthetic in trigger point injections, and this changes the frequency equation considerably. Corticosteroids carry their own well-documented risks when administered repeatedly. A narrative review on the role of intramuscular corticosteroids in trigger point injections noted that prolonged or high-dosage corticosteroid use can cause weight gain, bone loss, and suppression of the body’s hormonal stress-response system. Case reports describe serious adverse events, including adrenal suppression and bone tissue death, after even a single dose of injected corticosteroid.⁶

Because of these risks, steroid-containing trigger point injections are generally limited to fewer sessions per year than plain lidocaine injections. Many pain specialists now avoid steroids in trigger point injections altogether, since the evidence that steroids add meaningful benefit over local anesthetic alone is thin. If your provider does include a steroid, you should expect wider spacing between sessions and a firm ceiling on total injections per year. Ask specifically what is in the syringe.

Injections Work Better When Paired with Rehabilitation

One of the most consistent findings in the trigger point literature is that injections alone, without any follow-up exercise or stretching, tend to give shorter-lasting relief. The randomized trial on noncardiac chest pain found that patients who received both trigger point injections and a stretching program showed significantly greater pain reduction than those who did stretching alone, and the benefit persisted at three months.¹ The injection opens a window where the muscle relaxes and pain drops, and exercise during that window helps maintain the improvement.

Home self-care also plays a role in extending the time between injections. Research on ischemic pressure (sustained manual compression of a trigger point) followed by stretching found measurable improvements in pain scores and pressure-pain thresholds compared to a control group doing only range-of-motion exercises.⁷ Techniques like foam rolling, tennis ball compression, and targeted stretching can be done between injection visits and may reduce the total number of sessions you need.

The practical message is that if you are getting trigger point injections but doing nothing else, you are likely to need them more frequently and for a longer period. Building a home program of stretching and self-treatment between sessions is one of the most effective ways to space out your visits.

When Repeated Injections Are Not Enough

Some people keep coming back for trigger point injections every few weeks for months or years without ever achieving lasting resolution. This pattern deserves a closer look, because it may signal that the problem is not purely myofascial or that the treatment approach needs to change.

A pediatric study on anterior cutaneous nerve entrapment syndrome illustrates this vividly. Patients who had the nerve entrapment alone achieved functional recovery within about 100 days. But patients who also had a comorbid somatic symptom disorder required far more injection sessions (a median of 19 versus 2) and none of them achieved functional recovery during follow-up, despite getting immediate pain relief from each injection.⁸ While that study dealt with a specific population, the principle applies broadly: immediate pain relief from an injection does not always translate into functional improvement, and when it does not, piling on more injections is rarely the answer.

If you have had more than four to six injection sessions targeting the same trigger point without meaningful, lasting improvement, most pain specialists would suggest reassessing the diagnosis, exploring whether central sensitization or another pain amplification process is involved, or transitioning to a different treatment approach entirely.

How Trigger Points Feed Widespread Pain

One of the more surprising findings in trigger point research is that numbing a single trigger point can reduce pain sensitivity in body parts far from the injection site. This phenomenon points to central sensitization, a state where the nervous system amplifies pain signals. Peripheral input from an active trigger point can sustain that amplification.

A study in chronic whiplash patients found that injecting lidocaine into carefully identified trapezius trigger points produced immediate and dramatic results: cervical range of motion increased by roughly 30 to 50 percent across all directions, and pain thresholds rose not only at the injection site but also at the forearm and shin, locations with no direct connection to the trapezius.⁹ Among patients who had photophobia before the injection, most of them lost their light sensitivity immediately after. A double-blind, placebo-controlled crossover study confirmed that these effects were specific to lidocaine injection of the trigger point and did not occur with sham injections.¹⁰

Similarly, research in fibromyalgia patients showed that lidocaine trigger point injections increased local pain thresholds and also reduced heat pain sensitivity at the forearm, a site far from where the injection was given. Placebo injections did not produce this effect.¹¹ This finding matters for the frequency question because it suggests that even if an injection’s local anesthetic effect wears off in hours, the “reset” of central nervous system pain processing can outlast the drug itself. For some patients, less frequent but precisely targeted injections may be more effective than frequent ones aimed at every sore spot.

Dry Needling and the Injectate Debate

A persistent question in the field is whether it matters what you inject, or whether the needle itself does most of the work. Dry needling uses a thin needle without any medication, and some studies find it performs comparably to injections with local anesthetic. A trial comparing dry needling, lidocaine trigger point injections, and exercise for jaw pain found that all three groups improved significantly, with no statistically significant difference between them at 30 days.²

A systematic review of trigger point injection therapies for chronic neck and back pain found similar patterns: lidocaine and dry needling both provided short-term pain relief, and while lidocaine tended to show slightly greater reductions in pain scores than dry needling, the differences between groups were generally not statistically significant.¹² This has implications for frequency: if you are concerned about the cumulative muscle toxicity of repeated local anesthetic injections, dry needling offers a way to get a similar mechanical disruption of the trigger point without adding a myotoxic drug each time. That said, dry needling without anesthetic tends to be more painful during the procedure itself, so patient tolerance becomes a factor.

Botulinum Toxin for Refractory Cases

When standard trigger point injections stop providing adequate or lasting relief, botulinum toxin (commonly known by brand names like Botox) is sometimes used as an alternative. The appeal is that botulinum toxin blocks nerve signaling at the muscle for a much longer period than local anesthetics, potentially reducing how often you need to come back. A clinical review found evidence suggesting that the effect of botulinum toxin injections in myofascial trigger points can persist for about 12 weeks, and that the treatment may be particularly useful in patients whose pain has not responded to other injection therapies.¹³

However, botulinum toxin is not a clear-cut upgrade. A randomized double-blind crossover trial that compared botulinum toxin to bupivacaine trigger point injections in myofascial pain syndrome patients did not find overwhelming evidence of superiority for the toxin in all cases.¹⁴ Botulinum toxin injections are also considerably more expensive and are not always covered by insurance for myofascial pain. The best candidates tend to be people with well-localized, refractory trigger points who have already tried and failed standard injection therapy. For those patients, the longer duration of action can mean going from monthly sessions to quarterly ones.

Safety Risks That Are Not About Frequency

Beyond the cumulative tissue concerns of repeated injections, there are acute risks that apply to every single session and that can influence where and how often injections are performed. The most serious of these is pneumothorax, a collapsed lung, which can occur when trigger points in the upper back, shoulders, or neck are injected and the needle inadvertently punctures the pleural lining.

A case report and literature review found that trigger point injections in the cervicothoracic region carry a recognized risk of pneumothorax.¹⁵ Another case report emphasized that the use of long needles in this region is strongly discouraged unless performed under real-time imaging guidance.¹⁶ This risk is rare but serious, and it is one reason some providers prefer ultrasound guidance for injections near the chest wall. Ultrasound guidance has been increasingly recommended to improve both safety and accuracy of needle placement.¹⁷

Other potential complications from any given session include local soreness, bruising, infection at the injection site, and vasovagal reactions (feeling lightheaded or fainting). These are generally mild, but they are worth knowing about because experiencing significant soreness after every session can itself become a limiting factor in how frequently you tolerate treatment.

The Underlying Physiology of Trigger Points

Understanding what is actually happening inside a trigger point helps explain why injections work and why they sometimes need repeating. Electromyographic studies have found that trigger point loci generate spontaneous electrical activity not seen in surrounding normal tissue. This activity appears to result from excessive acetylcholine release at dysfunctional motor endplates, which sustains a localized muscle contraction and increases the metabolic demands of that muscle segment.¹⁸ The result is a self-reinforcing loop: the contracted muscle fibers compress local blood vessels, reducing oxygen supply, which in turn generates pain-sensitizing chemicals that keep the contraction going.

When a needle disrupts this taut band, whether or not it delivers medication, it can mechanically break the contraction cycle and briefly restore blood flow. Adding a local anesthetic quiets the nerve signaling further. But if the factors that created the trigger point in the first place are still present, such as poor posture, repetitive strain, or stress-related muscle guarding, the cycle can restart. That is why injections alone tend to offer temporary relief and why the research consistently points toward combining them with physical therapy, ergonomic changes, and stress management for more durable results.