IMS Therapy: What It Is and What It Actually Treats

Chronic back pain that won't quit, no matter what you try, often comes down to something surprisingly specific: one shortened, overly sensitive muscle putting ongoing tension on the tendons around it. The result is a familiar cycle — pain, stiffness, and reduced mobility in that part of your body, that never quite resolves no matter how much you stretch or rest. IMS is one of the more targeted tools for breaking that cycle. What is IMS? IMS — Intramuscular Stimulation, sometimes called dry needling — is a treatment that uses thin needles to help reduce pain at its actual source. During an IMS session, a small needle is inserted directly into a specific muscle that has shortened and is now causing pain. It's been shown to be an effective way to treat chronic neuropathic or musculoskeletal pain, particularly the kind that hasn't responded well to more general approaches like stretching, massage, or rest. How does it actually work? When a needle is inserted into a shortened muscle, that muscle relaxes and lengthens. The mechanism behind this is neurological: the nerve responsible for instructing that muscle gets, in effect, reset. Once that reset happens, communication between the nerve and the shortened muscle is re-established and normalized. That's what allows the muscle to return to normal function and movement — and as it relaxes and lengthens, the pain associated with the tension eases as well. What you'll actually feel depends on the state of the muscle. If a needle goes into a relaxed muscle, you'll typically barely notice it. But with a muscle that's shortened and sensitive — which is exactly why you're receiving IMS in the first place — expect a brief, deep ache or twitch when the needle is first inserted. That sensation is normal, and it usually fades shortly after. The benefits of IMS, broken down IMS helps in a few distinct ways, each addressing a different part of the pain cycle: 1. Improved circulation. When the needle is inserted, a tiny, controlled injury is created at the site. In response, blood is drawn to the shortened muscle. That improved circulation helps deliver nutrients and supplies to the area, while also helping clear out the build-up of metabolic waste that tends to accumulate in chronically tight tissue. 2. Muscle relaxation. IMS stimulates the stretch receptor within the muscle. This helps the muscle relax, directly reducing pain, stiffness, and spasm — rather than just masking the sensation temporarily. 3. Reduced tendon stress. By easing the underlying muscle tension, IMS also reduces the pull that muscle was placing on the tendons attached to it — often the actual source of the referred pain someone feels, even when the muscle itself is the root cause. IMS versus acupuncture — what's the actual difference? On the surface, IMS and acupuncture can look nearly identical: both use thin needles, both are inserted into the body, and to an untrained eye the sessions might seem interchangeable. The theory behind each, however, is completely different. Acupuncture is rooted in traditional Chinese medicine. Needles are inserted into specific points along meridians — pathways believed to correspond to different organs and systems throughout the body, often at some distance from where the pain is actually felt. IMS, by contrast, has its roots in Western medicine and functional anatomy. The same type of needle is often used, but the placement is different: IMS typically targets the area you're actually having pain in — directly in the belly of the muscle causing the problem, rather than at a point believed to correspond to it elsewhere. Both approaches have their place, and some clinicians use elements of each. But if your goal is targeting one specific muscle you already know is the source of your pain, IMS's direct, anatomically-driven approach tends to be the more precise tool. What does IMS treat? IMS is used across a wide range of pain presentations, particularly ones tied to a specific muscle or muscle group. Common conditions include: - Achilles tendonitis - Chronic low back pain - Golfer's elbow - Headaches (particularly tension-type headaches originating from neck and shoulder muscles) - Plantar fasciitis - Sciatica - Shin splints - Shoulder injuries - Sports injuries more broadly - Tennis elbow - TMJ pain What connects this list is less the location of the pain and more the mechanism: a muscle that has become shortened, overactive, or "stuck," referring pain to a joint or tendon nearby. What to expect after a session It's common to feel some soreness for a day or two following IMS — similar to the feeling after a hard workout. This is a normal part of the process, not a sign that anything's gone wrong. Staying gently active (rather than resting completely) in the days after typically helps the muscle settle faster. Most people need more than one session to see lasting change, particularly for pain that's been present for months or years. A physiotherapist trained in IMS will typically reassess after each session to determine whether the muscle is responding as expected, and adjust the treatment plan — including how many muscles are treated and how frequently — based on that response. A few practical things worth knowing IMS is generally well tolerated, but like any needle-based treatment, it's not for everyone. People on blood thinners, those with a needle phobia, or anyone pregnant should flag this to their physiotherapist before starting — not because IMS is inherently risky, but because the assessment and approach may need to be adjusted. A trained physiotherapist will screen for this as part of a normal intake process. It's also worth setting expectations around sensation versus pain. The twitch or deep ache during needle insertion is a sign the needle has found the muscle it's targeting — it's part of how the treatment works, not a complication. Mild bruising at the insertion site is common and typically resolves within a few days. Is IMS right for you? IMS isn't the first tool reached for in every situation, and it isn't meant to be. It tends to be most effective when a few things line up: the pain has a clear muscular component, it's been resistant to more general treatment, and a thorough assessment has actually located the specific muscle responsible. This is why IMS is typically delivered by a physiotherapist trained specifically in the technique, following a proper assessment — not applied broadly on the assumption that "needling something" will help. If you've been dealing with a stubborn ache that stretching hasn't touched, or pain that keeps returning to the same spot no matter how much you rest it, that's worth raising directly with your physiotherapist. It may be exactly the kind of presentation IMS is built for. The bottom line If a muscle has been "off" for a while, and general stretching, foam rolling, or rest hasn't touched it, IMS might be the missing piece of the plan. It's not a replacement for a broader treatment approach — exercise, movement retraining, and addressing why the muscle shortened in the first place still matter — but as a tool for breaking a stubborn pain cycle at its actual source, it's one of the more precise options available.