The three most common shoulder injuries are rotator cuff tears, shoulder impingement syndrome, and labral tears. Shoulder pain is the third most frequent musculoskeletal complaint in primary care, behind only low back pain and knee pain, and these three diagnoses account for the vast majority of cases. Each one affects a different structure in the shoulder, feels different, and follows a different path to recovery.
Rotator Cuff Tears
Your rotator cuff is a group of four muscles and their tendons that wrap around the ball of your shoulder joint, holding it snugly in the socket. A tear in one or more of these tendons causes pain, weakness, and reduced range of motion. The hallmark symptom is a deep ache in the shoulder that often worsens at night, making it hard to sleep on the affected side. You may also notice weakness when lifting your arm overhead or rotating it outward, like reaching for a seatbelt.
These tears come in two varieties. A partial tear damages the tendon without severing it completely. A full-thickness tear goes all the way through, sometimes pulling the tendon off the bone entirely. They can result from a single injury, like a fall or catching something heavy, but more often they develop gradually from repetitive overhead motions or simple age-related wear. About 25% of people over 60 have a full-thickness rotator cuff tear on imaging without any symptoms at all, and many of those tears stay painless for years. This means a tear found on an MRI isn’t automatically the source of your pain.
X-rays can’t show the tear itself but can rule out bone spurs or arthritis. Ultrasound and MRI are the go-to imaging tools for confirming the diagnosis. Ultrasound has the advantage of letting a provider examine both shoulders side by side and watch the tendon move in real time.
Treatment depends on the size of the tear and how much it limits your life. Many partial tears and some full-thickness tears respond well to physical therapy focused on strengthening the remaining rotator cuff muscles and improving shoulder mechanics. If surgery is needed, recovery is a long road. Patients typically wear a sling and begin gentle pendulum exercises the day after surgery. Active movement starts around six weeks. Light sports become possible at roughly three months, lifting a moderate weight overhead takes about ten months, and a full return to sports or demanding leisure activities averages 14 months.
Shoulder Impingement Syndrome
Shoulder impingement happens when the tendons of the rotator cuff get pinched in the narrow space between the top of your arm bone and the bony shelf of your shoulder blade (the acromion). Every time you raise your arm, those tendons and the fluid-filled cushion above them have to slide through that gap. When the gap narrows, the soft tissues get compressed, leading to inflammation and pain.
Several things can shrink that space. Some people are born with a more hooked or downward-sloping acromion that leaves less room. Bone spurs from arthritis can encroach on the area. But the most common culprits are functional: weak or poorly coordinated rotator cuff muscles allow the ball of the shoulder to drift upward during arm elevation, and abnormal movement of the shoulder blade can tip the acromion downward. Tightness in the back of the shoulder capsule also shifts the joint mechanics in ways that increase compression. This is why impingement is so common in swimmers, painters, and anyone who works repeatedly with their arms overhead.
The pain typically builds gradually. It starts as a sharp catch when you reach overhead or behind your back, then progresses to a constant ache along the outside of the shoulder. Reaching into a back pocket or hooking a bra can become surprisingly painful.
Physical therapy is the first line of treatment, and targeted exercises clearly outperform doing nothing. Strengthening the rotator cuff and the muscles that control your shoulder blade can restore normal joint mechanics and open up that compressed space. Specific, guided exercise programs also outperform generic “just stretch and strengthen” approaches. Whether surgery is ultimately better than dedicated rehab remains genuinely uncertain. Some research finds a slight edge for surgery on pain relief, but functional outcomes are similar, and many patients improve enough with exercise alone to avoid an operation.
Labral Tears
The labrum is a ring of rubbery cartilage that lines the rim of the shoulder socket, deepening it and helping the ball of the arm bone stay centered. When it tears, the shoulder loses some of that built-in stability. Two types dominate.
A Bankart tear occurs at the lower front of the labrum and is the classic injury from a shoulder dislocation. When the ball of the joint pops forward out of the socket, it shears off the labrum on its way out. This is why people who dislocate a shoulder once are at higher risk of dislocating it again: the torn labrum no longer provides the same restraint.
A SLAP tear (superior labrum, anterior to posterior) involves the top of the labrum where the biceps tendon anchors into the socket. These tears typically result from either a compression force, like falling onto an outstretched hand, or a sudden traction injury where the arm is yanked while extended. They’re common in overhead athletes, particularly baseball players and volleyball players, who repeatedly stress that biceps anchor point.
The signature symptom of a labral tear is mechanical: clicking, catching, or a sensation of something shifting inside the joint as you move your arm. You may also feel a vague deep ache that’s hard to pinpoint, along with a sense that the shoulder could “give way” during certain movements. Pain often flares with overhead activity or when the arm is in a cocked-back throwing position.
Diagnosing Labral Tears
Labral tears are trickier to see on imaging than rotator cuff injuries. A standard MRI catches only about 29% of labral tears. MR arthrography, where contrast dye is injected into the joint before scanning, raises that detection rate to roughly 74%. This is why a provider who suspects a labral tear will often order the contrast-enhanced version. Even so, arthroscopic surgery, where a small camera is inserted into the joint, remains the definitive way to confirm the diagnosis and assess the damage.
Small, stable tears often improve with physical therapy aimed at strengthening the rotator cuff and shoulder blade muscles to compensate for the lost labral support. Larger tears, especially Bankart tears in younger, active people who want to return to contact sports, frequently require surgical repair to restore stability and prevent recurrent dislocations.
Reducing Your Risk
All three injuries share overlapping risk factors: weak rotator cuff muscles, poor shoulder blade control, and limited flexibility. A simple prevention routine targets both strength and mobility. External rotation exercises with a resistance band strengthen the rotator cuff muscles that keep the ball centered in the socket. Rows and scapular squeezes train the muscles that stabilize your shoulder blade against your ribcage. Pendulum exercises and cross-body stretches maintain the flexibility needed to move without compensation patterns that load the wrong structures. Doing these a few times a week takes about ten minutes and addresses the mechanical imbalances behind most non-traumatic shoulder problems.