Shoulder Pain at Night and a Weak Arm: Is It a Rotator Cuff Tear?
By Dr. Niranjan Ghag · 6 min read
Most people with a rotator cuff tear do not come to a clinic because they cannot lift a suitcase. They come because they have not slept properly in three weeks. Night pain and a slow loss of strength overhead are the two symptoms that bring this diagnosis to light — and the question that follows is almost always the same: does this need an operation? Usually not, at least not first.
Why does a rotator cuff tear hurt worse at night?
Night pain is one of the most characteristic features of a rotator cuff tear. The American Academy of Orthopaedic Surgeons lists pain at rest and at night — especially lying on the affected shoulder — alongside pain lifting or lowering the arm, weakness when lifting or rotating it, and sometimes a crackling sensation on movement. Sleep is usually the first thing to go. The usual explanation is that lying down removes the bracing you unconsciously give the shoulder all day, though that is taught more firmly than it has been proven. The pattern is what matters: pain worse in bed, worse on that side, with weakness rather than pure stiffness.
Is this a rotator cuff tear or a frozen shoulder?
The single most useful distinction is what happens when someone else moves your arm. In a frozen shoulder the capsule itself is tight, so the shoulder will not move through its full range even passively. In a cuff tear the tendon that lifts the arm is damaged, so active movement is weak, but passive range is usually preserved. A two-minute examination separates them faster than a scan.
| Feature | Rotator cuff tear | Frozen shoulder |
|---|---|---|
| Lifting the arm yourself | Weak, and often painful | Blocked by stiffness |
| Someone else moving your arm | Usually moves through range | Also blocked — the capsule is tight |
| Night pain | Common, worse lying on that side | Common, particularly in the painful phase |
| Strongly associated with | Age over 40, overhead work, the dominant arm | Diabetes and thyroid disease |
Does every rotator cuff tear need surgery?
No — and this is the part that often surprises people. The AAOS reports that in about 80 to 85% of patients, non-surgical treatment relieves pain and improves shoulder function. That treatment is not simply rest: it is activity modification, anti-inflammatory medication where appropriate, and a structured strengthening programme done properly over months, not a fortnight. A steroid injection can help if pain is blocking rehabilitation — on average it relieves roughly two-thirds of patients for at least three months, though not everyone, and repeat injections carry risks. The counterpoint is that a tear can enlarge, so 'wait and see' only works when paired with actual follow-up.
| Non-surgical treatment | Surgical repair | |
|---|---|---|
| Suits best | Degenerative tears; lower overhead demand; pain dominant, weakness mild | Acute traumatic tears; overhead workers and athletes; marked weakness |
| Main advantage | Avoids surgical risk, infection, stiffness and re-tear entirely | Restores the tendon attachment; the best chance of regaining true strength |
| Main disadvantage | The tear can enlarge; some activities may need to be given up | Sling for 4–6 weeks; months of rehabilitation; a real re-tear rate |
| Time to know if it worked | Usually 6–12 weeks of proper physiotherapy | 4–6 months for functional strength; up to a year for full recovery |
What does the research actually say about rotator cuff repair?
Less than most people assume, and that is worth knowing before agreeing to an operation. A Cochrane review of nine trials in 1,007 participants examined rotator cuff surgery; three of those trials, with 258 participants, compared repair directly against exercise-based non-operative treatment. At one year, repair probably gave little or no clinically important improvement in pain, and may have given little or no improvement in function or quality of life — certainty rated moderate for pain, low for function. That is genuinely uncertain evidence, not a settled case against surgery. The limits matter: the trials studied mainly small, degenerative supraspinatus tears in people aged roughly 56 to 68, and six excluded subscapularis tears. The reviewers state plainly that their conclusions may not apply to traumatic tears, large subscapularis tears, or young people, and the trials did not run long enough to say whether repair prevents later arthritic change. So: a strong argument for trying rehabilitation first in a middle-aged degenerative tear — not against repairing the shoulder of a 35-year-old who tore the cuff falling off a bike.
When is surgery genuinely the right call?
Continued pain despite proper non-surgical treatment is the main reason to operate. The AAOS also lists symptoms lasting six to twelve months, a large tear (more than 3 cm) where the surrounding tendon is still good quality, significant weakness and loss of function, and a tear from a recent acute injury. Needing the arm overhead for work or sport shifts the balance too. Most repairs are arthroscopic day-case procedures, and open, mini-open and arthroscopic repairs give similar results — surgeon experience matters more than technique.
If I do have surgery, how long is the recovery?
Longer than most people expect, and it is not negotiable. The repaired tendon has to heal back onto bone, and that biology sets the pace regardless of how motivated you are or how fit you were beforehand. Expect a sling and no active use of the arm for roughly the first four to six weeks.
- 1Weeks 0–6: sling, with passive movements guided by a therapist usually starting within this window
- 2Weeks 4–6 onwards: active movement without the therapist supporting your arm
- 3Weeks 8–12: strengthening work begins
- 4Months 4–6: most patients have a functional range of motion and adequate strength
- 5Full recovery takes several months; re-tear is possible after any repair, and the risk rises with the size of the original tear
When should you get the shoulder looked at sooner rather than later?
Get it assessed promptly if the arm went suddenly weak after a fall or heavy lift, particularly if you cannot lift it at all. An acute traumatic tear is one of the situations where earlier surgery is more often right, and sudden inability to lift the arm can also point to a fracture or dislocation. Otherwise, shoulder pain and weakness that has not settled after six weeks is a reasonable point to be examined. Bring any scans you have, but do not rely on them to decide: some cuff tears cause no symptoms at all, and it is the examination that connects the image to your problem — and that gives you the widest set of options, most of which do not involve an operation.
Sources & further reading
- Rotator Cuff Tears — symptoms, diagnosis and non-surgical treatment — American Academy of Orthopaedic Surgeons (OrthoInfo)
- Rotator Cuff Tears: Surgical Treatment Options — indications, rehabilitation and outcomes — American Academy of Orthopaedic Surgeons (OrthoInfo)
- Karjalainen TV et al. Surgery for rotator cuff tears (Cochrane Review, CD013502) — Cochrane Database of Systematic Reviews 2019, Issue 12 (record via PubMed, PMID 31813166)
Shoulder pain keeping you awake, or an arm that has become weak overhead? It is worth having examined rather than scanned repeatedly — the examination is what decides the treatment. Read about sports injury & arthroscopy care and keyhole (arthroscopic) surgery with Dr. Ghag, see our guide to frozen shoulder if stiffness is your main problem, or book an assessment in Thane West.
Frequently Asked Questions
Why does my shoulder hurt more at night than during the day?
Pain at rest and at night — especially lying on the affected side — is one of the classic features of a rotator cuff tear, along with weakness lifting or rotating the arm. It is often the loss of sleep, rather than loss of function, that finally brings people to a clinic.
Can a rotator cuff tear heal on its own without surgery?
A torn tendon does not reattach itself to bone, but the shoulder can often become pain-free and functional without surgery. The AAOS reports that non-surgical treatment relieves pain and improves function in about 80 to 85% of patients. That requires a properly structured strengthening programme over months, not just rest.
How do I know if it is a rotator cuff tear or a frozen shoulder?
The key test is passive movement. With a frozen shoulder the capsule is tight, so the arm cannot be moved through its full range even by someone else. With a rotator cuff tear, active lifting is weak and painful but passive range is usually preserved. An examination usually separates the two quickly.
Is rotator cuff surgery actually better than physiotherapy?
For small degenerative tears in middle-aged shoulders, a Cochrane review found repair probably gives little or no clinically important benefit over exercise at one year. But the reviewers were explicit that this may not apply to traumatic tears, large tears involving the subscapularis, or younger patients — where repair remains appropriate.
How long does recovery take after arthroscopic rotator cuff repair?
Roughly four to six weeks in a sling with passive movement, active movement from about six weeks, strengthening from eight to twelve weeks, and functional range with adequate strength by four to six months in most patients. Full recovery takes several months and depends heavily on completing rehabilitation.
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