Rotator cuff injury
Also called: rotator cuff tear, rotator cuff tendonitis, shoulder impingement, cuff strain. Clinical name: Rotator cuff tendinopathy and rotator cuff tear (supraspinatus most commonly).
Most rotator cuff pain improves over 6–12 weeks of structured strengthening. Full-thickness tears do not knit back, but many become pain-free with rehab; sudden post-injury weakness needs prompt assessment.
What it actually is
The rotator cuff is a group of four muscles whose tendons wrap the top of the shoulder like a cuff, steering and stabilising the joint through every reach and throw. When people talk about a rotator cuff injury they mean anything from an irritated, overloaded tendon, common in anyone who works or trains overhead, to a partial tear, to a tendon torn clean through, either in one bad fall or gradually with the wear of decades.
The symptoms are remarkably consistent: pain over the outside of the shoulder that flares when reaching overhead or behind, a painful arc partway through lifting the arm, and, most tellingly, pain at night when you lie on it. What separates the irritated tendon from the true tear is usually weakness. A shoulder that hurts but works is most often tendinopathy; a shoulder that suddenly cannot lift the arm after a fall has likely torn, and that version deserves prompt assessment because early repair matters more for larger traumatic tears.
The treatment story is more optimistic than most people expect. The first-line fix for the majority is not surgery but a patient, progressive strengthening programme, and most cuff-related pain improves substantially over six to twelve weeks of it. Even many full-thickness tears become strong and comfortable without repair. The rehab is slow and the gains hide week to week, which is exactly why a tracked record of reach, night pain and resistance used beats memory: it is the only place the progress is actually visible.
How bad is it?
Rotator cuff problems sit on a spectrum rather than in neat grades. Tendinopathy or impingement is an irritated, overloaded tendon: painful arcs when lifting the arm, sore lying on that side, but strength largely intact. A partial-thickness tear means some tendon fibres have failed: similar pain, often more weakness. A full-thickness tear means the tendon has torn through, from a fall or wrenching injury or as gradual wear; weakness is usually more obvious, and sudden weakness after trauma deserves prompt assessment. Context matters: many pain-free shoulders over 50 have tears on scans, so what is treated is the shoulder in front of the clinician, not the picture.
How long will it take?
Recovery moves in phases. This is the typical shape of it — yours may run faster or slower, and the numbers below are general ranges, not a forecast for your specific injury.
When to get it looked at
Most cases settle with time and sensible loading. Get it assessed by a professional if any of these apply — they can point to something that needs hands-on care:
- Sudden weakness or inability to lift the arm after a fall or wrenching injury (possible acute full-thickness tear; get assessed promptly)
- A dislocated-looking or deformed shoulder after trauma
- Constant unrelenting pain, fever, or a hot swollen joint
- Numbness, tingling or weakness spreading down the arm into the hand
- Night pain severe enough to wake you every night despite several weeks of sensible rehab
This is a list of warning signs, not a diagnosis. If you are worried, or the pain is severe, see a GP, physiotherapist or urgent care.
What to track while you recover
Shoulder rehab is slow enough that progress hides in plain sight. Week to week it feels like nothing is happening; the log is what shows the reach getting higher and the nights getting quieter.
- Pain score, 0–10, at rest, on your worst movement of the day, and at night
- How high the arm reached today without sharp pain (to shoulder height, above head, behind back)
- Nights woken by the shoulder, and whether you could lie on that side
- Rehab sets and the resistance used, so progressive overload is real rather than remembered
- Tasks that were possible or impossible: overhead shelf, seatbelt reach, throwing, serve
This is exactly what InjuryLog does.
Log each of these in seconds, watch the trend build day by day, and keep every scan and receipt tied to this one injury. Free on iOS, Android soon.
Wondering how long yours will take? Try the free recovery time estimator for a typical, phased timeline by injury and severity.
What to tell your physio
Shoulder assessment is pattern-recognition: which movements hurt, which are weak, and how it behaves at night. Arrive with the pattern already written down and the appointment starts in third gear.
- How it started: a specific injury or fall, or a gradual build with overhead activity
- The movements that reliably provoke it, and whether there is a painful arc when raising the arm sideways
- Night pain: how often, and whether lying on that side is possible
- Any true weakness, things you cannot lift now that you could, versus movements you avoid because of pain
- Work and sport demands overhead, and what a good outcome looks like for you
Walk in with the whole picture.
InjuryLog turns your daily logs into a clean Physio Visit Pack, a one-page summary your physio can actually read, so the first appointment starts with facts, not guesswork.
The questions people actually ask
How long does a rotator cuff injury take to heal?
Irritated tendons (tendinopathy or impingement) typically improve meaningfully over six to twelve weeks of progressive strengthening, though full resolution can take several months and night pain is often the last thing to go. Partial tears follow a similar arc. Full-thickness tears are different: the torn fibres do not reattach by themselves, but a good proportion of people still become strong and comfortable with rehab. If surgery is needed, the repair itself takes months to protect and rehabilitate, so timelines run in seasons rather than weeks.
Can a rotator cuff tear heal on its own?
A torn tendon does not knit itself back to the bone, so in the literal sense a full-thickness tear does not heal on its own. But that is not the same as needing surgery: many people, particularly with degenerative tears, get strong, comfortable shoulders through strengthening the remaining cuff and the muscles around the shoulder blade, and guidelines generally support trying structured rehab first for most non-traumatic tears. The main exceptions are younger people and sudden traumatic tears with real weakness, where earlier surgical repair tends to be favoured.
What does a rotator cuff tear feel like?
The classic pattern is pain over the outside of the shoulder and upper arm, worse reaching overhead, out to the side, or behind you, plus night pain when lying on that shoulder. There is often a painful arc partway through lifting the arm sideways. Weakness is the differentiator: struggling to lift the arm or hold it up against light resistance suggests a tear rather than just an irritated tendon, and sudden weakness after a fall is the version that should be seen promptly.
Do I need an MRI for my rotator cuff?
Not at first, in most cases. The diagnosis is usually made from the story and examination, and initial treatment, progressive strengthening, is the same for most cuff-related pain, so a scan rarely changes the early plan. Imaging earns its place when there has been significant trauma, when true weakness suggests a full tear, or when a proper block of rehab has failed and surgery is on the table. Worth knowing: scans find cuff tears in many pain-free shoulders over 50, so results are interpreted alongside your symptoms, not instead of them.
What are the best exercises for a rotator cuff injury?
The strongest evidence is for progressive resistance work targeting the cuff itself (external and internal rotation with a band or light weight) and the shoulder-blade muscles that give the cuff a stable platform, rows, and controlled raises within the pain-tolerable range. The principles matter more than the menu: start light, progress the load gradually, expect a little discomfort but not sharp pain, and give it weeks rather than days. A physio can tailor the specifics to whether your problem is irritation, a partial tear, or a full tear.
Why does my rotator cuff hurt more at night?
Night pain is almost the signature symptom. Lying down changes the blood flow dynamics in the tendon, removes the distraction of the day, and, most mechanically, lying on the shoulder compresses an already irritated tendon while lying on the other side can leave the sore arm hanging into a stretched position. Propping the affected arm on a pillow so it is supported slightly away from the body helps many people. Improving night comfort is usually one of the first signs the rehab is working, and unrelenting night pain despite weeks of rehab is worth reporting to a clinician.
Sources
- Shoulder pain — NHS
- Rotator Cuff Tears — AAOS OrthoInfo