Overview
A shoulder dislocation happens when the upper arm bone (humerus) comes out of the shoulder socket (glenoid) at the ball-and-socket joint. This usually occurs after a sudden injury, such as a fall or a sports impact. When the joint shifts out of place, it can tear or stretch stabilizing structures like the labrum and capsule, causing significant pain and limited movement. Because nerves and blood vessels can be irritated or injured during the dislocation, prompt evaluation is important.
Symptoms
Patients typically feel sudden, severe pain in the shoulder with visible deformity or an "out of place" appearance. The arm often looks held in a protected position, and even small movements can be extremely painful. Swelling and bruising may develop quickly, and numbness or tingling can occur if nearby nerves are affected. You may also notice weakness or an inability to lift the arm, grip normally, or use the hand comfortably.
Causes
Shoulder dislocation most often results from a traumatic event that forces the humeral head out of the glenoid, commonly with the arm in an abducted and externally rotated position. The shoulder joint relies on muscles, the labrum, and the capsule for stability, and injury can stretch or tear these supports. In some people, recurrent instability may develop even after an initial injury, especially when healing leaves the joint less stable. Less commonly, seizures or electrical injuries can trigger dislocation without a typical sports or fall mechanism.
Risk Factors
Participation in contact sports, climbing, or activities with fall risk increases the chance of dislocation. Prior shoulder dislocation or untreated shoulder instability is a major risk factor for future dislocations. Younger adults and active individuals may be more likely to dislocate again due to higher activity levels and greater disruption to stabilizing tissues. Reduced shoulder strength, poor mechanics, or connective-tissue laxity can also increase vulnerability.
Prevention
To reduce risk and recurrence, focus on restoring shoulder strength and control after the injury, especially of the rotator cuff and scapular stabilizers. Avoid returning to high-risk activities too quickly and follow a graded rehab plan from your clinician or physical therapist. Use protective equipment and learn safe techniques for falls and sports movements when possible. If you develop feelings of looseness or instability, it's important to address mechanics and stability rather than "pushing through."
How the Diagnosis Is Evaluated
Clinicians start with a history of how the injury occurred and whether you have numbness, weakness, or circulation changes in the arm or hand. A physical exam looks for deformity, range of motion limitations, tenderness, and nerve and vascular status. Imaging is used to confirm the dislocation and check for associated fractures; X-rays typically confirm alignment and rule out bone injury. Additional imaging such as ultrasound or MRI may be considered when instability persists or when there's concern for labral tears, rotator cuff injury, or significant soft-tissue damage.
Nonsurgical Treatment Options
The initial priority is often closed (non-surgical) reduction, performed as soon as safely possible to restore joint position and reduce pain. After reduction, a sling or immobilization period may be recommended briefly to protect healing, followed by early, safe movement guided by symptoms. Pain control commonly includes ice, activity modification, and medications such as NSAIDs if appropriate for you. Physical therapy is the cornerstone of recovery and helps restore range of motion, strength, and shoulder stability to lower the risk of recurrence. If pain persists due to associated inflammation or soft-tissue injury, your clinician may consider image-guided corticosteroid injections or other injection-based options on a case-by-case basis, such as platelet-rich plasma for selected soft-tissue problems, while continuing rehab as the main treatment.
When to Seek Medical Attention
Seek emergency or urgent medical care right away if your shoulder looks dislocated, you have severe pain after trauma, or you cannot use the arm normally. Get prompt care if you notice numbness, tingling, worsening weakness, pale or cold fingers, or any problem with circulation, because nerve or blood vessel injury must be ruled out. Contact medical services urgently if there is fever, rapidly increasing swelling, uncontrolled pain, or suspicion of an associated fracture. Even if the deformity appears to have "gone back," it's still important to be evaluated for recurrent instability and hidden injuries.
Frequently Asked Questions
Many dislocations can be managed with closed reduction and rehabilitation, and surgery is not required for every case.
The first step is medical evaluation and, when appropriate, prompt closed reduction to put the joint back in place safely.
Sling use varies by injury severity and clinician preference, but it is usually brief and followed by a guided rehab plan.
Do I need an MRI after a dislocation?
Next Steps
If you suspect a shoulder dislocation, get evaluated promptly so the joint can be checked and safely reduced if needed. After reduction, follow a structured rehabilitation plan to restore motion and stability and to reduce the chance of recurrence. If you have numbness, circulation changes, or worsening weakness, seek urgent care immediately.