Shoulder tendonitis, more accurately called rotator cuff tendinopathy, is the most common cause of long-lasting shoulder pain in UK adults. If you have a dull ache on the outside of your shoulder, a sharp catch when you reach overhead, or pain that keeps waking you at night, this guide will help you understand what is going on, what the UK evidence says actually works, and when it is time to book an appointment.
Key facts at a glance
Shoulder tendonitis is pain and reduced function caused by an overloaded or irritated rotator cuff tendon. The rotator cuff is a group of four small muscles (supraspinatus, infraspinatus, subscapularis and teres minor) whose tendons wrap around the top of your upper arm bone. Together they steady the shoulder joint and help you lift and rotate your arm.
When those tendons are asked to do more than they are ready for — a decorating weekend after a quiet winter, a return to serve-heavy tennis, a spell of overhead work, or simply years of steady use — the tissue changes. The changes are usually more like a stressed rope than a torn one, which is why modern clinicians prefer the term tendinopathy.
Tendonitis / tendinitis: the older word, implying inflammation (“-itis”). Still widely used by the NHS and by most patients.
Tendinopathy: the more accurate current term. Biopsies show the tissue changes are only sometimes inflammatory; more often they are degenerative or reactive.
Rotator cuff related shoulder pain / subacromial pain syndrome: the umbrella labels now used in NHS trust pathways and by the British Elbow & Shoulder Society (BESS), because the exact structure causing the pain is often impossible to identify without imaging — and imaging rarely changes what you do next.
For the rest of this article we use shoulder tendonitis and rotator cuff tendinopathy interchangeably, because they describe the same problem.
Shoulder tendonitis sits alongside a few close relatives that can cause similar pain, and we cover each of them in more detail elsewhere on the site:
The typical picture is a dull ache on the outer or front of the shoulder that becomes sharp with certain movements — reaching overhead, behind your back, or across your body — and often disturbs sleep on the affected side.
People with rotator cuff tendinopathy commonly describe some or all of the following:
If pain shoots below the elbow, includes tingling or numbness in the hand, or is accompanied by weakness that appeared suddenly, the cause may not be the cuff — see the red flags section and the differential table below.
The simplest way to think about tendon problems is load versus capacity. The tendon has a capacity for work — determined by your age, fitness, sleep, general health and history — and problems appear when the load you place on it exceeds that capacity, or when capacity drops and the usual load suddenly feels too much.
In UK adults, the risk of rotator cuff problems rises with:
Old advice used to focus heavily on the shape of the bony “acromion” above the tendons, and on the idea that surgery to remove a small hook of bone could stop the impingement. That model has largely been overturned by the last decade of research: cuff pain is now understood as a whole-shoulder problem in which posture, capacity, workload and general health matter more than one bony detail.
Rotator cuff tendinopathy is diagnosed clinically — that is, by an experienced clinician taking your history and examining your shoulder, not by a scan. This is the position taken by the current UK British Elbow & Shoulder Society (BESS) subacromial shoulder pain pathway, and by most NHS shoulder services.
A typical physiotherapy assessment will include:
Scans are usually not required to start treatment. Ultrasound and MRI both show cuff changes in a large proportion of people who have no shoulder pain at all — so a “finding” on a scan is not necessarily the cause of your symptoms. Population studies of older adults (the Chingford cohort in older UK women, for example) have found that around a fifth had a full-thickness cuff tear, and roughly half of those tears caused no pain.
Imaging is useful when: symptoms are severe or not settling after 6–12 weeks of good conservative care; a significant traumatic tear is suspected; a specialist is planning an injection or surgery; or there is diagnostic uncertainty (for example, a suspected frozen shoulder in early stages).
Several conditions share features with rotator cuff tendinopathy. The table below is a starting point — not a substitute for assessment.
| Condition | Typical clues | Key differences from cuff tendonitis |
|---|---|---|
| Rotator cuff tendinopathy | Gradual outer-shoulder ache, painful arc, disturbed sleep, weakness when lifting | Baseline against which the others are compared |
| Frozen shoulder | Deep pain that came on over weeks, followed by loss of movement in all directions | Passive rotation is markedly limited — a clinician cannot rotate your arm outward, even when you relax |
| Cervical radiculopathy (trapped nerve in the neck) | Pain that spreads below the elbow, pins and needles, weakness in a specific hand or arm muscle | Neck movements often reproduce arm symptoms; sensation changes below the shoulder |
| Acromioclavicular (AC) joint problem | Point tenderness right on top of the shoulder, pain reaching across the body | Symptoms sit on top of the shoulder, not on its outer edge |
| Traumatic rotator cuff tear | Sudden onset after a fall on an outstretched hand or a heavy lift; marked weakness | Warrants earlier orthopaedic assessment, especially in adults under about 65 |
| Referred pain from the heart, chest or gallbladder | Shoulder ache with breathlessness, chest tightness, sweating, nausea or shoulder-tip pain that is not affected by movement | A medical emergency — not a physiotherapy problem |
Call 999 or go to A&E immediately if you have shoulder pain with:
Contact your GP the same day if you have:
The table below grades each of the treatments patients most often ask us about, against current UK guidance (BESS 2025 subacromial shoulder pain pathway, NICE, NHS Evidence-Based Interventions) and the two large UK randomised trials on this topic (GRASP and CSAW).
| Treatment | UK evidence grade | What that means for you |
|---|---|---|
| Exercise and clear advice | Strongly positive | First-line care. Quality of the advice and the plan matters more than the number of sessions. |
| Manual therapy | Conditionally positive, short-term | A helpful adjunct alongside exercise, particularly in the early painful phase. |
| Steroid injection | Short-term benefit only | A reasonable option after 6–8 weeks without improvement, primarily to enable rehabilitation. Does not change long-term outcome. |
| Shockwave (ESWT) for calcific tendinopathy | Research only (NICE HTG645) | NICE considers the evidence of efficacy inadequate. Only appropriate with a transparent conversation about the uncertainty. |
| Shockwave for non-calcific cuff tendinopathy | Little or no important effect (very low evidence) | Not a first-line option. |
| Therapeutic ultrasound | Little or no important effect | We do not recommend it as a treatment on its own. |
| TENS, acupuncture, dry needling | Insufficient or very low-quality evidence | May offer short-term comfort for some people but are not core treatments for tendinopathy. |
| Platelet-rich plasma (PRP) | Uncertain (very low evidence) | Specialist-only; not routine. |
| Subacromial decompression surgery | Restricted (NHS EBI); not first line (BESS) | Rarely needed. Considered only after an adequate trial of non-surgical care, and CSAW found no clinically important benefit over placebo surgery. |
The UK GRASP trial (Hopewell et al., The Lancet, 2021) followed 708 people with rotator cuff disorders across 20 NHS trusts. It compared a 12-week progressive exercise programme delivered by physiotherapists with a single session of best-practice advice. At 12 months, both groups had the same shoulder pain and disability scores. This is a remarkable finding: it tells us that the quality of the initial assessment, education and plan matters more than the volume of sessions. It is why we spend a full hour with you on your first appointment.
That does not mean everyone needs only one session. Some people need extra hands-on support, progression of their programme, or help through a difficult flare-up. But it does mean that if you leave your first appointment with a good understanding of what is going on, a clear plan you can carry out yourself, and confidence in what to do when pain flares, you are already most of the way to recovery.
Hands-on techniques — joint mobilisations, soft-tissue work, targeted stretches — can reduce short-term pain and stiffness, which makes it easier to do the exercises that create the longer-term change. They work best as an adjunct rather than a stand-alone treatment. If you want more detail, our page on manual therapy at CK Physio explains how we use it, and our post on soft-tissue mobilisation techniques covers the underlying principles.
A subacromial steroid injection can reduce pain in the short term (typically the first six to twelve weeks) but does not change how the shoulder looks in a year’s time. GRASP found that adding an injection to advice gave a modest extra benefit only at the eight-week mark. UK guidance suggests considering one injection in primary care after 6–8 weeks without improvement, and there is no added benefit from multiple injections. Injections work best when paired with a graded rehabilitation plan — using the pain window they open to build strength you can keep.
Extracorporeal shockwave therapy (ESWT) delivers pulses of acoustic energy through the skin into the tissue. It is widely offered by private physiotherapy clinics for calcific tendinopathy of the shoulder. It is important that patients understand the current UK position honestly:
Because CK Physio provides shockwave, we want to be transparent about this. We do not offer shockwave as a headline treatment for shoulder tendinopathy, and we discuss the current uncertainty in the evidence before we recommend it for anyone. Where it may be worth considering is in persistent calcific tendinopathy that has not settled with rehabilitation, as a step before more invasive options. If you would like to read more about the technology, our shockwave for shoulder and neck pain guide covers this in depth.
Therapeutic ultrasound (the gel-and-probe machine, not diagnostic ultrasound scanning), TENS machines, laser therapy and passive stretching without any strengthening component all have little evidence of clinically important benefit for rotator cuff tendinopathy. That does not mean they cannot feel good in the moment; it means they should not be the main thing anyone spends time or money on for this condition.
For most people with rotator cuff tendinopathy, no. The landmark UK CSAW trial (Beard et al., The Lancet, 2018) randomised 313 patients across 32 UK hospitals to arthroscopic subacromial decompression, arthroscopy only, or no treatment. Decompression was no better than a placebo (arthroscopy alone). NHS Evidence-Based Interventions guidance now restricts the procedure to a small group of appropriate cases. Full-thickness traumatic tears in younger adults remain an important exception and are usually assessed by an orthopaedic shoulder specialist.
The table below outlines a general framework we often use, in phases. Exercises must be individualised: the right starting phase, dosage and rate of progression depend on your assessment, so please treat this as an illustration rather than a prescription.
A useful rule of thumb: pain up to about 4 out of 10 during exercise that settles within 24 hours is usually acceptable. Pain that spikes, spreads or lasts into the next day means the load was too high or the exercise was not right for this stage.
| Phase | Typical timeline | Example exercises | Purpose |
|---|---|---|---|
| 1. Settle | Weeks 0–2 | Pendulum swings; gentle scapular squeezes; pain-free active range within a comfortable arc | Calm the shoulder without deconditioning it |
| 2. Load | Weeks 2–6 | Isometric external rotation (band or door frame); scapular wall slides; low-load resisted rotation | Build tendon and cuff capacity in comfortable ranges |
| 3. Strengthen | Weeks 6–12 | Progressive resistance for cuff and scapular muscles; controlled reaching drills; rows and presses at appropriate ranges | Restore strength and confidence through fuller range |
| 4. Return to activity | Weeks 12+ | Sport-, work- or hobby-specific patterns: overhead loading, throwing progressions, ladder work, gardening drills | Rebuild the specific capacity your life needs |
The current evidence does not point to any one exercise protocol as clearly superior — eccentric, isometric, heavy slow resistance and progressive resistance all show broadly similar results. What matters most is that the plan is progressive, that it targets the movements you struggle with, and that it fits into your week.
Most people improve significantly over six to twelve weeks, with continued gains up to about six months. That is the pattern reported by UK NHS shoulder services and by the BESS 2025 pathway, which describes rotator cuff related shoulder pain as usually a self-limiting condition with most symptoms responding within three months.
Longer-term data are more sobering, and it is only fair to share them. UK primary-care studies have shown that a meaningful minority of people — around one in seven — are still consulting about the same shoulder pain three years later. International cohort studies suggest that around half of new shoulder episodes have completely resolved by six months, rising to around three in five by one year.
This is why we prefer honest ranges to headline percentages. Most people do well. A minority struggle. Getting good early advice, sticking with a graded plan and staying active are the things that stack the odds in your favour.
Book an appointment if any of these apply to you:
CK Physio has been treating shoulder pain from our clinic on Elthorne Avenue in Hanwell since 2003. Our physiotherapists are all HCPC-registered and Chartered members of the CSP. Our shoulder pathway follows current UK guidance and reflects what the best trials tell us actually helps.
What to expect from your first appointment:
We accept most major private medical insurers, including BUPA and AXA PPP. Home visits are available for patients across West London who cannot easily attend the clinic — see our home-visit physiotherapy guide for details. Session fees are shown on our bookings page.
You can also read more about our related work in:
Yes, in practice. “Tendonitis” is the older word (used by the NHS and by most patients). “Rotator cuff tendinopathy” is the current clinical term because the tissue changes are usually degenerative or reactive rather than purely inflammatory. Both describe pain from an overloaded or irritated rotator cuff tendon.
Modify, do not rest. Short-term reduction of the movements that flare it is sensible for a week or two. After that, gentle, progressive movement usually settles pain faster than avoidance — shoulders that stop moving stiffen quickly.
Usually not to start treatment. Rotator cuff tendinopathy is diagnosed clinically. Scans are helpful when symptoms are severe or unresponsive to good conservative care, when a significant tear is suspected after trauma, or when a specialist is planning an injection or surgery.
It can be, in the right circumstances. The best UK evidence shows short-term pain relief in the first 6–12 weeks, but no change in the longer-term outcome. Injections are most useful when paired with a rehabilitation plan, and current UK guidance suggests one injection after 6–8 weeks without improvement, with no added benefit from multiple injections.
NICE guidance (HTG645, 2022) considers the evidence of efficacy inadequate and recommends the procedure be used only in the context of research. Recent meta-analyses show wide-ranging effect sizes but with high heterogeneity and low certainty. If you are considering shockwave, make sure you have an honest conversation with your clinician about this uncertainty first.
For most people with rotator cuff tendinopathy, no. The UK CSAW trial found that keyhole decompression surgery was no better than placebo surgery, and NHS Evidence-Based Interventions guidance now restricts the procedure. Surgery is more often considered for full-thickness traumatic tears, especially in younger adults.
Yes. You can book directly with any private physiotherapist, including CK Physio. Many NHS areas also offer self-referral, and the NHS shoulder pain page has more information on that.
Most major UK insurers cover physiotherapy for shoulder pain, subject to your plan’s excess and session limits. We accept BUPA and AXA PPP among others; please check with your insurer about referral requirements before your first appointment.
Most people improve significantly within six to twelve weeks, with continued gains up to about six months. A minority take longer or have symptoms that come and go over years. Early advice, a graded plan and staying active are the biggest factors in your favour.
This article was written by reviewed by the chartered physiotherapy team at CK Physio, a West London physiotherapy practice established in 2003. All clinicians named on our website are registered with the Health and Care Professions Council (HCPC) and hold chartered status through the Chartered Society of Physiotherapy (MCSP)on 28 Sept 2026. We plan to next review it in 28 Sept 2026.
Methodology. We prioritised current UK guidance (the British Elbow & Shoulder Society 2025 subacromial shoulder pain pathway, NICE guidance and NHS Evidence-Based Interventions), UK randomised trials (GRASP and CSAW), and UK primary-care and cohort data. Where we used international evidence we said so. We did not cite trial results we could not independently verify.
Conflict of interest. CK Physio provides some of the treatments discussed in this article, including manual therapy and shockwave therapy. We have flagged this and represented the current UK evidence position for shockwave as-is, including its limitations.
General information notice. This article provides general information and is not a substitute for individual clinical assessment or medical advice. If your symptoms are severe, are not settling, or you are worried, please consult a Chartered Physiotherapist, your GP or NHS 111.