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Rotator cuff injury: symptoms, rehab & when to get it checked

Written by Elliot Stubbs, BSc (Hons) Physiotherapy, 13 years in MSK practice. Updated 14 October 2026.

A rotator cuff injury is irritation, overload or tearing of the group of four small muscles and tendons that keep your shoulder joint steady as you move your arm. It usually causes pain when lifting the arm out to the side or overhead, and when lying on that shoulder. Most people improve with a progressive strengthening programme rather than rest, but suddenly being unable to lift your arm after a fall needs prompt medical assessment.

What is the rotator cuff, and what goes wrong?

The rotator cuff is four small muscles that start on the shoulder blade and wrap around the top of the arm bone. Their tendons (the tough cords that attach muscle to bone) keep the ball of the joint centred in its shallow socket while bigger muscles do the lifting.

Clinicians often use the umbrella term rotator cuff related shoulder pain, because several overlapping problems behave similarly. The two you'll most likely hear about are:

• Tendinopathy, where the tendon has become irritated, usually because the load on it has outpaced what it's conditioned for. You may also hear older labels such as impingement or bursitis for similar symptoms.
• A tear, which can be partial (part of the tendon thickness) or full thickness (all the way through). Tears can happen suddenly with an injury, or develop gradually with age, and many older adults have some tearing without any pain at all.

Both often respond to the same core treatment: building the shoulder's strength step by step.

What does a rotator cuff injury feel like?

Common features include:

• A dull ache on the outside of the upper arm
• Pain when lifting the arm out to the side or overhead, often worst through the middle part of the movement
• Pain reaching behind your back, such as tucking in a shirt or doing up a bra
• Pain lying on the affected side, and disturbed sleep
• Weakness when holding the arm out, such as lifting a kettle

Typical triggers are a sudden increase in overhead work, such as decorating or a new gym programme, repetitive sport like swimming or tennis, or a fall onto an outstretched arm. Often there is no single moment of injury.

Also see your GP if you have constant night pain that doesn't change with position, unexplained weight loss or a history of cancer with new shoulder pain, or pins and needles, numbness or weakness travelling down the arm. A physiotherapy assessment screens for all of these before treatment starts.

Simple self-checks that are safe to try

These won't diagnose your shoulder, but they are a useful guide. Stop if anything is sharply painful.

• Can you lift the arm by yourself? Slowly raise it out to the side and overhead. Pain through the middle of the movement is a common pattern with an irritated cuff. If you can't lift it on your own but can with help from your other arm, get it assessed soon, particularly after an injury.
• Is it pain or stiffness? If the shoulder is just as stiff when someone else gently moves it for you, it may be something else, such as a frozen shoulder.
• How does it behave over 24 hours? Pain that settles by the next morning is reassuring. Pain that builds day after day suggests the load is too much.

What can you do now?

• Modify, don't stop. Reduce what clearly flares it, such as heavy overhead lifting, but keep using the arm for everyday tasks.
• Avoid long periods in a sling unless a doctor has advised one, as it tends to make the shoulder stiffer and weaker.
• Help your sleep. Lie on the other side hugging a pillow.
• Pain relief. Ask a pharmacist about suitable options.
• Start gentle loading. Pressing the back of your hand into a wall without moving the arm (a static hold) is often well tolerated early on.

Why is strengthening exercise central to rotator cuff rehab?

Tendons adapt to the load placed on them. Rest calms symptoms but doesn't rebuild capacity, so the shoulder is no better prepared when you return to normal activity. A graded exercise programme steadily increases what the tendon and surrounding muscles can tolerate, which is why exercise sits at the centre of treatment rather than being an optional extra.

What does gym-based shoulder rehab involve?

Sessions here run in a fully equipped gym with 1:1 guided rehab, so the programme can go well beyond resistance bands at home. A typical progression:

• Settling phase: static holds, light band work, and shoulder blade exercises
• Building phase: cable or dumbbell rotation work, rows and presses, with load increased week by week
• Return phase: heavier and overhead lifting, and movements specific to your work, sport or training

Hands-on treatment can help ease pain early on.

How long does rotator cuff recovery take?

It varies with the problem, how long you've had it, and what you need the shoulder to do. Many people notice a meaningful change within six to twelve weeks of consistent rehab, while getting back to heavy or overhead activity can take several months.

When do you need a scan or a surgical opinion?

Most people don't need a scan to start rehab, because tendon changes are common on scans even in people with no pain. A scan or specialist opinion is usually worth discussing when:

• You lost the ability to lift your arm suddenly after a fall or injury. A significant new tear can be time-sensitive, so prompt assessment matters.
• Things aren't improving after a consistent trial of rehab, typically a few months.

Your physiotherapist can then advise you to see your GP, who can arrange imaging or a referral. A GP or orthopaedic specialist can also discuss other options, such as injections or surgery, where appropriate.

Shoulder physio in Wymondham, Norwich and South Norfolk

If you're in Wymondham, Norwich or South Norfolk and your shoulder is limiting your sleep, work or training, Elliot assesses and treats shoulder problems on Tuesday evenings at Suggs Gym, Wymondham, alongside his full-time NHS role assessing complex musculoskeletal conditions. An initial assessment is £65 for 45 minutes, follow-ups £55 for 30 minutes (see pricing), and you can book directly without a GP referral. See how much private physio costs and self-referral for physiotherapy.

Frequently asked questions

This guide is general information written by a physiotherapist, not a substitute for individual assessment. If in doubt about any of the red flags above, seek medical attention immediately rather than waiting for an appointment.