Your shoulder contains tendons, muscles, cartilage, ligaments, and a joint capsule, and any of these can tear. The shoulder is the most mobile joint in the body, which also makes it one of the most vulnerable. Here’s a breakdown of each structure that can be injured, what causes each type of tear, and what it feels like.
Rotator Cuff Tears
The rotator cuff is the most commonly torn structure in the shoulder. It’s a group of four tendons that hold the top of your upper arm bone firmly in the shoulder socket while allowing you to lift and rotate your arm. These tendons can fray gradually from years of wear or tear suddenly from a fall, lifting something heavy, or a forceful overhead motion.
Rotator cuff tears are classified as either partial or full-thickness. A partial tear goes partway through the tendon, leaving some fibers intact. A full tear goes all the way through, sometimes detaching the tendon from the bone entirely. Both types cause pain that tends to worsen at night and when reaching overhead or behind your back. Full tears often come with noticeable weakness, making it difficult to lift your arm away from your body.
These injuries are remarkably common, especially with age. Between 7% and 22% of the population over 40 has some form of rotator cuff disease, and up to 50% of people over 80 have rotator cuff tears. Many of these tears cause no symptoms at all. In one study of people with no shoulder pain (average age 44), MRI scans revealed full-thickness tears in about 10% of them. So the presence of a tear doesn’t always mean you’ll feel it.
Labrum Tears
The labrum is a ring of tough cartilage that lines the rim of your shoulder socket, deepening it and helping keep the ball of the arm bone centered. When this cartilage tears, the shoulder can feel unstable, painful, or like something is catching inside the joint. There are two main types of labrum tears, defined by where on the rim they occur.
A Bankart lesion is a tear at the bottom front of the labrum. It happens when the shoulder dislocates, forcing the arm bone out of the socket and into the surrounding cartilage. Car crashes, falls, and contact sports are the usual culprits. If you’ve ever dislocated your shoulder, there’s a good chance you’ve damaged the labrum in this location.
A SLAP tear occurs at the top of the labrum, running from front to back. Unlike a Bankart lesion, this type doesn’t typically result from a dislocation. Instead, it comes from forceful shoulder movements like throwing, swinging a racquet, or heavy overhead lifting. SLAP tears can happen in a single moment or develop gradually from repetitive strain. Pain tends to sit over the top of the shoulder socket, while a Bankart lesion is felt more in the lower front.
Biceps Tendon Tears
Your biceps muscle connects to the shoulder through a tendon that runs over the top of the arm bone and attaches inside the joint. This tendon can tear partially or completely, and the moment it goes is hard to miss. Most people feel sudden, sharp pain in the upper arm, sometimes accompanied by an audible pop or snap.
Other signs include bruising that spreads from the upper arm toward the elbow, cramping in the biceps during activity, and weakness when bending the elbow or rotating the forearm. The most distinctive sign is called a “Popeye deformity.” Because the torn tendon can no longer hold the muscle taut, a visible bulge forms in the upper arm, with the muscle belly sitting noticeably lower (closer to the elbow) than on the other side. Flexing the biceps makes this asymmetry more obvious.
Many people with a biceps tendon tear at the shoulder can still function reasonably well, since other muscles compensate for the lost strength. The cosmetic change and some lingering weakness with rotation are often the biggest long-term effects.
AC Joint Ligament Tears
The acromioclavicular (AC) joint sits at the top of your shoulder where the collarbone meets a bony projection of the shoulder blade. Two sets of ligaments hold this joint together. When one or both sets tear, it’s called a shoulder separation, which is different from a dislocation.
Shoulder separations are graded on a scale from Type I to Type VI based on how many ligaments are damaged and how far the bones shift apart. In a Type I injury, the ligaments are only sprained and the joint stays aligned. Type II involves a torn ligament with mild shifting. By Type III, both sets of ligaments are torn and the collarbone visibly rides higher than normal. Types IV through VI are severe, high-energy injuries where the collarbone displaces dramatically, sometimes pushing backward through muscle or dropping beneath the shoulder blade. Most AC injuries fall in the Type I to III range and result from a direct blow to the shoulder, like landing on it during a fall or getting hit in a contact sport.
Pectoralis Muscle Tears
The pectoralis major is the large chest muscle that crosses the front of the shoulder and attaches to the upper arm bone. Its tendon is most vulnerable during what’s called an eccentric load, meaning the muscle is lengthening while under tension. The classic scenario is the downward phase of a bench press, when the bar is lowering toward the chest and the muscle is stretched under heavy weight.
A pec tear typically produces a sudden pop or ripping sensation, followed by immediate pain and weakness with any pushing motion. Bruising often appears across the chest and inner arm, and the shape of the chest can look uneven. One side of the armpit may lose its normal curve, or one nipple may sit lower than the other. These injuries occur most often in weight-training athletes, particularly men in their 20s to 40s.
Shoulder Capsule Injuries
The entire shoulder joint is enclosed in a flexible lining called the capsule, which is reinforced by thickenings known as the glenohumeral ligaments. When the capsule or these ligaments stretch or tear, the shoulder becomes unstable. People with capsular damage often feel the ball of the shoulder slipping out of the socket or “giving way,” particularly in certain positions like reaching behind the body or cocking the arm back to throw.
Capsular injuries usually result from a dislocation or repeated subluxations (partial dislocations). The giving-way episodes are commonly associated with pain, and the shoulder may lose some range of motion. Swelling and bruising can follow the initial injury. Over time, a damaged capsule can lead to chronic instability, where the shoulder continues to feel loose or dislocates with less and less force.
How Shoulder Tears Are Diagnosed
After a physical exam that tests range of motion and specific movements to stress individual structures, imaging confirms which tissues are damaged. Ultrasound, standard MRI, and MRI with a contrast dye injected into the joint (MR arthrography) all perform similarly well for detecting full-thickness rotator cuff tears, with sensitivity around 90–91% and specificity of 93–95%.
Partial-thickness tears are harder to catch. Ultrasound and standard MRI detect them about 67–68% of the time, while MR arthrography does better at around 83%. For labrum tears or subtle soft-tissue injuries, MR arthrography is generally the preferred tool because the contrast dye highlights structures that a standard MRI can miss.
Recovery After Surgical Repair
Recovery timelines depend heavily on which structure was torn and how severe the damage is. For rotator cuff repairs, the tendon takes six to eight weeks to heal to the bone. You’ll typically wear a sling for two to three weeks and start physical therapy about a week after surgery, continuing for three to four months. Strengthening exercises don’t begin until six to ten weeks post-surgery, once the initial healing is secure.
For small rotator cuff tears, full recovery takes roughly four months. Large tears need closer to six months. Severe, massive tears can take six to twelve months before you’re back to full function. Most people can return to daily activities around 12 weeks after surgery and resume driving within two to four weeks. Vigorous sports are typically restricted for four to six months.
Not every shoulder tear requires surgery. Many partial rotator cuff tears, some labrum tears, low-grade AC separations, and biceps tendon tears in older adults respond well to rest, physical therapy, and gradual strengthening. The decision depends on the severity of the tear, your activity level, and how much the injury limits your daily life.