A torn rotator cuff typically announces itself with a deep ache in the shoulder, pain that gets worse at night, and weakness when you try to lift your arm away from your body. Some tears cause sharp, stabbing pain; others produce a persistent dull ache that settles deep inside the joint. The combination of pain plus weakness is the most telling sign, because many shoulder problems cause pain alone.
What a Rotator Cuff Tear Feels Like
The pain from a rotator cuff tear is usually felt deep in the shoulder rather than on the surface. It often radiates down the outside of the upper arm, sometimes reaching as far as the elbow. You might describe it as a dull ache at rest that sharpens when you reach overhead, behind your back, or out to the side.
Night pain is one of the hallmark signs. Many people first notice something is wrong because they can’t sleep on the affected side, or they wake up when they roll onto that shoulder. The pain tends to intensify when the arm is at rest, which catches people off guard since they expect movement to be the main trigger.
Beyond pain, pay attention to weakness. A torn rotator cuff often makes it difficult to lift objects at or above shoulder level, hold your arm out to the side, or reach far away from your body. You might notice you’ve started compensating without thinking about it, using your other arm for things like grabbing a seatbelt or reaching into a high cabinet. Some people also hear or feel a crackling sensation when they move the shoulder into certain positions.
Partial Tears vs. Full-Thickness Tears
Not all rotator cuff tears are the same. A partial tear means the damage goes partway through the tendon’s thickness, like a frayed rope that hasn’t snapped completely. A full-thickness tear extends all the way through, creating a hole in the tendon. “Thickness” here refers to the depth of the tear, not its length or width.
Partial tears tend to cause the most pain when you lift things above shoulder level or hold objects far from your body. You may still have reasonable strength, and the shoulder might feel mostly fine at waist level. Full-thickness tears are more likely to cause obvious weakness, where you physically can’t hold your arm in certain positions even if you try. With a large full-thickness tear, your arm may drop involuntarily when you try to hold it out to the side.
Here’s what surprises many people: some rotator cuff tears, especially small partial tears and degenerative tears that develop slowly, cause very little pain. It’s possible to have a tear and not know it for months or years. The tear only becomes apparent when it progresses enough to cause noticeable weakness or when imaging is done for another reason.
Simple Tests You Can Try at Home
No home test can diagnose a tear with certainty, but two commonly used clinical tests can give you a rough sense of what’s going on. These are the same tests a doctor or physical therapist would perform in an office visit.
The Empty Can Test
Stand and raise your arm out to the side until it’s at shoulder height (90 degrees). Make a fist with your thumb pointing down, then angle your arm forward about 30 degrees so it’s slightly in front of you, not straight out to the side. This position looks like you’re pouring out a can. Now have someone press down on your forearm while you resist. If this produces pain, significant weakness, or both, the test is considered positive. In clinical studies, this test correctly identifies about 77% of supraspinatus tears when weakness is the main finding.
The Drop Arm Test
Have someone lift your arm straight out to the side to shoulder height with your palm facing down. Then slowly try to lower it on your own in a controlled motion. If your arm suddenly drops or you can’t control the descent, that suggests a full-thickness tear of the supraspinatus, the most commonly torn rotator cuff tendon. Pain during the lowering motion also counts as a positive result.
If both tests are positive, especially if you also have night pain and trouble reaching overhead, there’s a reasonable chance you’re dealing with a rotator cuff tear. But these tests aren’t definitive. Shoulder impingement, bursitis, and other conditions can produce similar results.
How Doctors Confirm the Diagnosis
Imaging is the only way to confirm a rotator cuff tear. The two main options are ultrasound and MRI, and research shows they perform similarly well. A large meta-analysis published in the British Journal of Sports Medicine found that both ultrasound and MRI detect full-thickness tears with about 90-91% sensitivity and 93-95% specificity. In practical terms, both catch the vast majority of complete tears and rarely produce false positives.
Partial tears are harder to spot. Both ultrasound and standard MRI detect only about 67-68% of partial-thickness tears. A specialized version called MR arthrography, where contrast dye is injected into the joint before scanning, does better at around 83% sensitivity. Your doctor may recommend this if a partial tear is suspected but a standard MRI looks normal.
X-rays won’t show a rotator cuff tear directly since tendons don’t appear on X-rays, but they can rule out other problems like fractures, bone spurs, or arthritis that might be contributing to your symptoms.
Acute Tears vs. Degenerative Tears
The way a tear starts matters for understanding your symptoms. An acute tear happens suddenly, usually from a specific event: a fall onto an outstretched hand, catching something heavy, or a forceful overhead motion. You’ll typically feel immediate sharp pain, sometimes hear a popping or snapping sensation, and notice sudden weakness. The shoulder may also swell.
Degenerative tears develop gradually from years of normal wear, repetitive overhead motions, or reduced blood supply to the tendons as you age. These tears often start as fraying and progress slowly. The pain builds over weeks or months, and you may not be able to pinpoint when it started. This type is far more common, especially in people over 40, and both shoulders are frequently affected over time.
If your pain came on suddenly after an injury and you’ve lost strength in the shoulder, that combination warrants prompt evaluation. Acute full-thickness tears generally respond better to surgical repair when addressed earlier rather than later, because the tendon can retract and the muscle can weaken the longer it goes without repair.
What Happens After Diagnosis
If you do have a rotator cuff tear, treatment isn’t automatically surgery. Research comparing surgical repair to conservative treatment (primarily physical therapy) shows a nuanced picture. People treated without surgery tend to improve faster initially, while those who have surgery may see slightly better function and pain scores at one and two years out. However, multiple randomized trials have found that the actual differences between the two approaches are small enough that they often don’t meet the threshold for what patients would notice as a meaningful improvement in daily life. People in the physical therapy groups in these studies showed significant, lasting improvement in their outcomes.
Physical therapy focuses on strengthening the remaining rotator cuff muscles and the muscles around the shoulder blade to compensate for the torn tendon. Many people with partial tears and small to moderate full-thickness tears do well with this approach alone, particularly if the tear is degenerative rather than acute.
Surgery is more strongly considered for acute tears in younger or active people, large or complete tears with significant weakness, and cases where several months of physical therapy haven’t improved symptoms. Recovery after surgical repair typically involves wearing a sling for four to six weeks, followed by a gradual rehabilitation program lasting several months. Most people don’t return to full activity for four to six months, and complete healing of the repaired tendon can take up to a year.