As a sports PT, I commonly see shoulder pain related to shoulder instability in athletes and active individuals. Many people describe their shoulder as feeling “loose,” “unstable,” “pinching,” or like it may “slip” during lifting, throwing, or overhead movements. Because people relate shoulder instability to the labrum and shoulder capsule, they assume their shoulder instability won’t improve unless they get surgery to fix these issues.
In reality, shoulder pain and instability often improve significantly through targeted strength and movement training. While the labrum may be involved, surgery is not usually required to completely return to high-level sports and exercise participation.
The issue usually comes down to how the shoulder handles load and maintains control during movement. The shoulder has a tremendous amount of mobility, which allows us to throw, reach overhead, swim, lift, and perform athletic movements. But greater mobility also requires greater stability.
When the muscles surrounding the shoulder blade and shoulder joint are unable to control movement effectively, stress can increase on the tissues around the shoulder. Over time, this can contribute to pain, irritation, and a feeling of instability.
The good news? While shoulder anatomy cannot be completely changed, improving strength, movement control, and shoulder positioning can significantly reduce symptoms and improve function.
Rather than relying only on rest or avoiding movements completely, the focus should be on building a stronger, more resilient shoulder system.
The Biggest Concerns of Shoulder Instability
Shoulder instability may result from a genetic tendency for hypermobility, a torn labrum, or weakness in the stabilizing muscles in the shoulder. When the shoulder does not stay closely in the socket during movement, it can pinch and stress the tissues and cause pain. Instability can lead to a higher risk of a dislocated shoulder, but often causes a lot of problems before this happens.
The shoulder relies heavily on surrounding muscles for stability, including the rotator cuff, upper back muscles, and muscles that control the shoulder blade.Individuals with an unstable shoulder should focus on improving the strength and coordination of muscles that keep the shoulder in socket. These muscles are strengthened by exercises that focus on pulling your arm into your body, pulling your arm backwards, and protracting your shoulders forward.
When these muscles struggle to manage load effectively, several issues can occur:
- Pain in the front, side, or back of the shoulder
- Pinching sensations during overhead movements
- Weakness during pressing or lifting activities
- Clicking or shifting sensations during movement
- Decreased power with throwing or sports activities
- Greater fatigue with repetitive overhead activity
Symptoms can develop gradually in addition to a specific labral injury.
Screen to Determine if Shoulder Instability is Causing Your Problem
Having occasional shoulder discomfort or movement differences does not automatically mean something is wrong. Many athletes have natural variations in mobility and shoulder structure without symptoms.
Shoulder instability becomes more of a concern when the shoulder loses control during movement, particularly with higher-demand activities.
A few simple movement screens can help identify whether the shoulder is handling load effectively:
End-range pain from overhead motion: Reach overhead as far back as you can. When you experience pain or a feeling of instability in your shoulder–without any decrease in range of motion or excessive range of motion compared to the unaffected shoulder–you may be looking at an issue of instability.
90-90 external rotation: The most common movement that produces pain in unstable shoulders is with your arm at 90 degrees from your body and your elbow bent at 90 degrees, while rotating your arm back (as if throwing it like a baseball). Excessive range, pinching, and fear of dislocation are indicators that instability is the main concern.
Strength with pulling inward toward your body: The easiest way to recreate this movement is by using a resistance band: starting with your hand up at the same level as your shoulder and pull it down to your side. Significantly weakness on the affected shoulder indicates the need for strengthening.
The key issue is usually not flexibility or mobility itself—it is whether the body can control movement effectively under increasing demands.
How Do You Address It?
While it’s impossible to change genetics or undo a labral tear, it is very reasonable to be able to strengthen the muscles which keep the shoulder in socket.
The goal is to improve strength, control, and stability so the shoulder can tolerate greater levels of activity.
Start by identifying movements that support shoulder stability, where your shoulder tires out quickly. This becomes your starting point for training.
The biggest priority is strengthening the muscles that help position the shoulder correctly.
Three movement patterns are especially important:
Shoulders back
Focus on exercises that strengthen the muscles between the shoulder blades and encourage improved posture and shoulder positioning.
Examples include:
- Band pull-aparts
- Rows
- Reverse fly exercises
Pulling inward
Strengthening the muscles that help pull the arm inward toward the body with the shoulders in the correct position will help stabilize the shoulder in its socket.
Examples include:
- Lateral pulldowns pulldowns with resistance band
- Practicing a support hold with shoulders back
Protraction of the shoulders
Shoulder protraction overhead means shrugging the shoulders as high up as you are able to. The muscles that create this motion heavily stabilize your shoulder during movement.
Examples include:
- Weighted shoulder protraction holds overhead
- Support hold shoulder shrugs focused on pushing as high as possible
As movement quality improves, gradually progress to more demanding activities until you can maintain good shoulder control during higher-level movements such as throwing, lifting, pressing, and sport-specific activity.
Strong Shoulders Support Strong Movement
Shoulder pain and instability are not automatically signs that something is damaged.
In many cases, symptoms develop because the muscles supporting the shoulder are being asked to do more than they can currently tolerate.
The goal is not simply reducing symptoms.
By strengthening the muscles that pull the shoulders back, pull towards the body, and protract the shoulders forward, you can often reduce pain and improve movement quality while returning to activity with greater stability and confidence.
The goal isn’t just getting rid of pain—it’s creating a shoulder that can tolerate the demands you place on it.