5 Causes of Shoulder Pain a Chiropractor Can Fix
The shoulder gets blamed for a lot of problems it didn't start.
Someone comes in with pain on the outside of the deltoid every time they press overhead. They've rested it, iced it, avoided the movements that hurt. Nothing sticks. The shoulder keeps flaring because the shoulder isn't the problem. A stiff thoracic spine changed how the scapula moves, which changed how the humeral head tracks in the socket, which overloaded the rotator cuff. The pain showed up in the shoulder, but the dysfunction started two joints away.
That pattern plays out in the majority of shoulder complaints we see as a chiropractor in San Diego. Understanding where it actually comes from is the difference between chasing symptoms and resolving the issue.
Why the Shoulder Depends on Everything Around It
Your shoulder is the most mobile joint in your body, and that mobility comes at a cost. Unlike the hip, which sits in a deep bony socket, the shoulder socket is shallow. Stability comes almost entirely from soft tissue: the rotator cuff muscles, the labrum, the ligaments of the capsule, and the coordinated movement of the scapula along the rib cage.
For the shoulder to move well, three things have to happen in sequence:
The thoracic spine extends and rotates to create space for the scapula to glide
The scapula upwardly rotates and tilts at the right timing to keep the socket under the ball
The rotator cuff centers the humeral head so the larger muscles can produce force without impingement
When any link in that chain stiffens or misfires, the shoulder compensates. Over time, that compensation becomes the injury. The five causes below are the ones we assess most frequently, and in nearly every case, the real driver is upstream.
Rotator Cuff Strain
The rotator cuff is four small muscles whose primary job is stabilization, not power. They hold the ball centered in the socket while the deltoid, pecs, and lats do the heavy lifting. When the scapula isn't positioning the socket correctly, or when thoracic stiffness forces the humeral head forward, the cuff has to work overtime to keep the joint from jamming.
That's not a strength problem. It's an overload problem. And the muscles driving it are rarely the ones that get attention.
Most people think of the lats as a "pull your shoulders back" muscle. They're not. The lats are powerful internal rotators. So are the teres major and the pec major. When all three are tight and dominant, they pin the humerus into internal rotation, drag the scapula forward, and force the smaller cuff muscles to fight a battle they can't win.
Meanwhile, the rhomboids lock the scapula in a retracted, downwardly rotated position that prevents the socket from tracking under the ball during overhead movement. The subscapularis, the one rotator cuff muscle that sits on the front side of the scapula, gets bound up in all of this and stops gliding the way it should.
That combination is what we see in the majority of cuff strains that walk through our door. The fix isn't more rotator cuff exercises. It's getting the lats, teres major, and pecs to release their grip on the humerus, restoring rhomboid length so the scapula can rotate freely, and mobilizing the subscapularis so it contributes to stability instead of adding to the restriction.
Rotator cuff strains typically show up as a dull ache along the outside of the shoulder that worsens with overhead reaching, a "dead arm" sensation during or after exercise, and pain reaching behind the back for a seatbelt or jacket sleeve. The ache often travels partway down the upper arm, which leads people to think the muscle itself is damaged. More often, the cuff is irritated from doing a job it was never meant to do alone.
That distinction matters for anyone rehabbing between training days, surf sessions, or long weeks at a desk: treating the cuff without addressing the internal rotation dominance underneath it is why so many shoulder problems come back.
Shoulder Impingement
Impingement means something is getting pinched in the subacromial space, the narrow gap between the top of the humerus and the bony shelf of the acromion. That "something" is usually a rotator cuff tendon or the bursa that cushions it. The result is a painful arc, typically between 60 and 120 degrees of arm elevation, sharp jabs with quick reaches, and night pain that makes side-sleeping miserable.
The pinch doesn't happen because the space is too small. It happens because the shoulder blade isn't clearing the way.
During normal overhead movement, the scapula should upwardly rotate and posteriorly tilt so the acromion moves out of the path of the rising humerus. When the thoracic spine is locked in flexion, which it often is after years of desk work, driving, or screen time, the scapula can't complete that rotation. The acromion stays low, the space narrows, and the tendon gets caught with every rep, every reach, every overhead wave.
Mobilizing the thoracic spine and ribs frees the scapula to rotate. Releasing posterior cuff tension lets the humeral head track posteriorly where it belongs. Strengthening the lower trapezius and serratus anterior teaches the scapula to stay out of the way during elevation. The impingement resolves not because the shoulder changed, but because the system around it started working again.
Frozen Shoulder
Frozen shoulder, or adhesive capsulitis, is a different animal. The capsule surrounding the glenohumeral joint thickens, tightens, and adheres to itself. Range of motion doesn't just decrease gradually: it hits a wall. External rotation and abduction are usually the first to go. Getting dressed, reaching a shelf, styling hair all become difficult or impossible.
The condition moves through three phases:
Freezing. Deep, constant ache, especially at night. Motion starts declining. This phase can last several months.
Frozen. Pain may ease somewhat, but stiffness is severe. The shoulder barely moves past a narrow window.
Thawing. Motion gradually returns. This phase is the longest, sometimes stretching past a year.
Frozen shoulder is more common between ages 40 and 65, and it has associations with diabetes, thyroid conditions, and prolonged immobilization after injury or surgery. Sometimes there's no clear trigger at all.
Chiropractic care during a frozen shoulder focuses on what's realistic in each phase. During the freezing stage, the goal is pain management and gentle joint mobilization that respects the irritability level. During the frozen stage, short-lever mobilization techniques gradually restore capsular extensibility without provoking a flare. Throughout all three phases, keeping the cervical spine, thoracic spine, and opposite shoulder healthy prevents the compensation patterns that develop when one arm can't do its job for months.
Honesty matters here: frozen shoulder is slow. No intervention makes it fast. But maintaining what motion exists, reducing the pain that disrupts sleep, and protecting the rest of the body from compensating is the difference between a difficult year and a year that creates three new problems.
Postural Load from Desk and Screen Habits
Hours of laptop work, phone scrolling, and seated commuting tilt the shoulder blade forward and downward. The pec minor shortens. The upper trapezius overworks. The lower trap and serratus anterior weaken from disuse. The net effect is a shoulder blade that sits in a position where impingement, biceps tendon irritation, and cuff overwork are inevitable.
This isn't a single injury. It's an accumulation. By mid-afternoon, the front of the shoulder feels tight, the base of the neck is stiff, and overhead movement is uncomfortable. The pattern is especially common among healthcare workers pulling long shifts and tech professionals working from home offices around Clairemont.
A quick self-check: stand relaxed and look at your palms. If they face behind you instead of toward your thighs, your shoulders are internally rotated more than they should be. If your head sits forward of your chest when you type, thoracic flexion is driving the problem.
Fixing it requires opening the anterior chain (pec minor release, gentle thoracic extensions), building endurance in the posterior stabilizers, and adjusting the workspace so the screen sits at eye level and the elbows stay under the shoulders. Short resets, 30 to 60 seconds several times per day, outperform one long stretch session at night. The desk and tech worker guide walks through the specific setup adjustments and movement patterns that make the biggest difference on a busy schedule.
Referred Pain from the Neck and Ribs
Not every shoulder problem lives in the shoulder. Irritated cervical facet joints, sensitive nerve roots, and rib restrictions can all refer pain into the deltoid region, across the shoulder blade, or down the arm past the elbow. This is the scenario where someone gets shoulder treatment for months and nothing changes, because the pain generator was never in the shoulder to begin with.
Clues that the pain is referred:
Neck stiffness or headaches alongside the shoulder ache
Tingling or numbness past the elbow or into the hand
Pain that changes more with neck position than shoulder movement
Shoulder range of motion that tests mostly normal despite significant pain
Cervical and upper thoracic adjustments address the joint irritation driving the referral. Rib mobilization restores the expansion that lets the scapula rest and move without restriction. Once the upstream source calms down, the shoulder "pain" resolves because it was never a shoulder problem. For a broader look at how extremity and joint care fits into the bigger picture, that overview explains the approach.
How to Tell Where Your Shoulder Pain Is Coming From
These self-screens aren't diagnostic, but they narrow the conversation before you walk in. If any movement produces sharp or escalating pain, skip it and come get assessed.
Behind-back reach. Can you comfortably reach the back pocket area with both hands? A significant side-to-side difference suggests capsular stiffness or internal rotation restriction.
Wall slide. Stand with your back flat against a wall and slide both arms overhead. If your low back pops off the wall to get your arms up, thoracic stiffness is limiting scapular motion, and the shoulder is compensating.
External rotation press. Stand in a doorframe and gently press your forearm outward against the frame with your elbow at your side. Tenderness that lingers suggests cuff irritation. A sharp catch suggests impingement.
Neck rotation test. If turning your head to the painful side reproduces or worsens the shoulder ache, the cervical spine is likely involved.
What Resolving Shoulder Pain Actually Looks Like
Every shoulder presentation is different, but the logic is the same. Identify whether the driver is the cuff, the capsule, the scapulothoracic rhythm, posture, or a referral from the cervical spine. Then restore motion where it's restricted, reduce irritation where it's acute, and rebuild the control that prevents recurrence.
For most mechanical shoulder problems, a realistic arc looks like this:
Weeks 1 to 2. Calm the acute irritation. Restore basic mobility. Identify which upstream links need attention.
Weeks 3 to 6. Reintroduce reach and light loading with proper scapular control. Movement becomes more comfortable and confident.
Weeks 6 to 12. Build the durability to handle real-life demand: overhead pressing, paddling, swimming, carrying kids, sleeping on your side without waking up.
Frozen shoulder follows a longer timeline. Honest expectations matter more than aggressive promises.
When to Get Help Beyond Chiropractic
Most shoulder pain is mechanical and responds well to conservative care. But some presentations need prompt medical evaluation:
Sudden severe pain after trauma with inability to lift the arm at all
Obvious deformity, significant numbness, or marked weakness that doesn't improve
A hot, swollen joint with fever or general malaise
We work alongside San Diego imaging and medical providers when the situation calls for it and will tell you directly if what you're dealing with needs a different kind of care first. That honesty is part of how we practice. You can read more about what chiropractic can and can't address for a clear-eyed look at where the boundaries are.
If your shoulder has been limiting what you do, whether it's an overhead press that hasn't felt right in months, a paddle-out that ends early, or a night's sleep that keeps getting interrupted, the answer is usually upstream from the pain. The shoulder pain page outlines how we approach it at Stein Chiropractic. When you're ready to start, your first visit is walk-in friendly and straightforward.