If you've ever had a therapist run a curved metal tool along your calf, your forearm, or the sides of your neck, you've probably had IASTM. It stands for Instrument Assisted Soft Tissue Mobilisation, and it's one of the treatment options I offer at my studio in East Brighton and on mobile visits across East Sussex.
The tools look a bit odd the first time you see them. Stainless steel, shaped like shallow curves or gentle hooks, designed to fit the contours of different body parts. People sometimes ask if they're the same as gua sha tools, and the answer is no, not quite. They share some history, but the way I use them in a clinical massage setting is different from traditional gua sha practice.
This post is my honest take on what IASTM is, what the research actually shows (the good and the less impressive), and when I reach for the tools during a session.
What IASTM Actually Is
IASTM is a form of soft tissue work where I use a specially designed instrument instead of my hands to apply pressure and movement to the tissue. The tool makes contact with the skin at an angle, usually somewhere between 30 and 60 degrees, and I move it along the muscle, fascia, or tendon in specific directions.
The rationale comes from older manual therapy work, particularly cross-friction techniques developed by a British orthopaedic doctor called James Cyriax back in the mid-twentieth century. The modern version really took off in the 1990s with the Graston Technique in the United States, and since then a handful of other systems have appeared: Graston, ASTYM, HawkGrips, Técnica Gavilán, and FAKTR among the better-known names. They use slightly different tools and slightly different protocols, but the underlying idea is similar.
What the tool gives me, as a therapist, is a few things my hands alone can't easily provide: more precise contact on small areas, better feedback through the instrument when I pass over a restriction in the tissue, less fatigue in my own hands and thumbs over a full day of clients, and in some cases the ability to work a little deeper without using excessive force.
What the Research Actually Says
I want to be straight with you here, because there's a lot of marketing fluff around IASTM online and I'd rather you had the real picture.
Strongest Evidence
Range of motion improvements. A systematic review and effect-size analysis (Seffrin et al., 2019) supports moderate evidence for short-term gains in joint mobility in uninjured participants.
Good Evidence
Pain relief in chronic neck pain and cervicogenic headache. A 2025 meta-analysis published in BMC Musculoskeletal Disorders found significant short-term improvements across these conditions.
Positive Signal
The same 2025 meta-analysis of 11 studies found moderate-certainty evidence that IASTM reduces pain and improves patient-reported function across multiple musculoskeletal conditions.
Weaker Evidence
Strength gains from IASTM are not yet recommended. The Seffrin et al. review noted methodological variability across studies makes firm conclusions difficult in this area.
The honest summary: IASTM looks helpful for short-term range of motion improvements and for pain relief in a range of common conditions, especially when combined with other treatment. It's not a magic wand, and the research base is still developing.
My Own First Experience With the Tools
By the time I finished, my neck felt freer than it had in years. Not just looser, but properly mobile in a way that surprised me.
The research is one thing, but the moment I really understood what IASTM could do was the day my RockBlades arrived. I sat down and worked on my own neck for about 7 minutes each side. Slow passes along the upper traps, the levator scapulae, and the muscles running up the back of the neck. The background tension I'd been carrying around without really noticing had dropped, and the difference lasted well beyond the session.
That's a single personal experience, not a clinical trial, and I wouldn't want to oversell it. But it was the moment I went from being curious about the tools to wanting to learn them properly and bring them into my work with clients. Since then I've used IASTM with a wide range of clients and the feedback has been genuinely positive. People often comment on how different the sensation is to traditional massage and how mobile they feel afterwards.
That said, IASTM isn't the be-all and end-all. No single tool or technique ever is. The best therapists I've trained with all share the same view: staying open to a variety of approaches and matching the right one to the person in front of you matters far more than being loyal to any particular method.
What's Actually Happening in the Tissue
The traditional explanation was that IASTM breaks down scar tissue and adhesions. Modern thinking is more nuanced. Research suggests IASTM may affect the vascular response to injured soft tissue by increasing blood flow, with animal studies showing increased tissue perfusion and altered microvascular morphology.
At the cellular level, the controlled microtrauma from the treatment appears to trigger an inflammatory response that increases fibroblast proliferation, collagen synthesis, and the remodelling of disorganised collagen fibres. These are the cells responsible for repair and maintenance of soft tissue. In plainer English: the treatment seems to stimulate the body's own repair processes. It's less about physically breaking anything up and more about nudging the tissue to reorganise itself and heal more effectively.
There's also likely a neurological component. Part of why you feel looser after treatment probably has to do with changes in how your nervous system is interpreting signals from that area, not just mechanical changes in the tissue itself. This is part of why I often combine IASTM with myofascial release, which works along similar neurological lines.
Where I Find It Most Useful in Practice
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01Stubborn tendon issues Tennis elbow, golfer's elbow, plantar fasciitis, and Achilles tendinopathy often respond well when IASTM is combined with loading exercises and other manual work. These are commonly treated as part of a sports massage session.
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02Scar tissue and post-injury stiffness If a surgery or significant soft tissue injury has left the area feeling stuck, the tools can work into tissue that's harder to reach with hands alone.
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03Runners and cyclists Brighton's hills and seafront routes put real load through the lower legs. IASTM fits well as part of a maintenance or recovery approach for calf, IT band, and shin complaints, often alongside assisted stretching.
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04Upper back and neck tension from desk work The research on chronic neck pain is some of the strongest in the IASTM literature, and it's a useful addition to broader deep tissue treatment for people stuck at laptops all day.
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05Forearm tightness in tradespeople and musicians Anyone who grips, types, or holds an instrument for hours benefits from focused work on the forearm flexors and extensors. The tools work particularly well in this small area.
What a Session Feels Like
During and After Treatment
The first thing most people notice is that the tool is cold. That settles once I've been working for a minute or two. The pressure is firm but shouldn't be agonising. There's a sensation often described as a deep scraping or a crunchy feeling when the tool passes over a tight area. Some people find that oddly satisfying.
After treatment you might see mild redness in the area. Occasionally a few tiny red dots called petechiae appear. These are small capillary responses. Neither is cause for concern and both usually fade within a day or two. Proper bruising shouldn't happen with good technique.
You may feel a bit sore the following day, similar to muscle soreness after a workout. That settles within 24 to 48 hours and is usually followed by better movement and less of the original tension.
When IASTM Isn't the Right Choice
IASTM isn't appropriate for everyone, and part of my job is knowing when not to use it. I won't use the tools over broken skin, active infections, or areas with certain skin conditions. I'll avoid or modify treatment if you have a bleeding disorder, are on blood-thinning medication, have recently had cortisone injections in the area, or have certain circulatory conditions. Pregnancy, cancer history, and recent surgery all warrant a careful conversation before treatment.
If you're unsure, mention it when you book and we can talk through it. I'd rather adjust the plan than push ahead with something that isn't right for you. You can also check the FAQ page or get in touch directly.
How IASTM Fits Into a Massage Session
I don't usually offer IASTM as a standalone treatment for the full hour. It works better as part of a session that also includes hands-on massage, some movement assessment, and often some stretching or exercise advice at the end.
A typical session might start with traditional massage to warm the tissue, move into targeted IASTM work on the areas that need it most, and finish with broader hands-on work to integrate everything. For some complaints I'll add cupping or myofascial release depending on what your body seems to want that day.
If you've booked a sports massage or a deep tissue session with me, IASTM is included as part of the toolkit when I think it'll help. There's no separate charge for it. Some sessions involve a lot of tool work, some involve none at all. It depends on you, not on a fixed protocol.
Frequently Asked Questions
Is IASTM the same as Graston?
Graston is a specific branded system and certification within the wider category of IASTM. I use the techniques and principles but I'm not a Graston-certified practitioner. Plenty of therapists use IASTM tools without being tied to any single brand.
Does IASTM leave bruises?
With good technique and appropriate pressure, no. You might get some mild redness or a few tiny red dots that fade quickly. If a therapist is leaving you with proper bruises, that's a sign they're using too much pressure.
How many sessions do I need?
For a specific issue like tennis elbow or plantar fasciitis, the research tends to use 4 to 6 sessions over a few weeks alongside other treatment. For general tension and maintenance, one session might be plenty, or you might want treatment every few weeks. I'll give you an honest view after your first session.
Can I do IASTM on myself at home?
There are self-treatment tools available and they can be useful for maintenance, though the learning curve is real and it's easy to be too aggressive with yourself. I'm happy to show you some simple self-care techniques at the end of a session if it's relevant.
Is it better than regular massage?
It's not better or worse, it's different. For some problems the tools give me an advantage. For others, hands are the right choice. A good therapist uses whatever fits the situation in front of them.