Tendonitis vs. Shoulder Impingement: What’s the Difference?
Shoulder pain can be frustrating, especially when you don’t know exactly what’s causing it. Two terms you may hear when dealing with shoulder pain are rotator cuff tendonitis (or tendinopathy) and shoulder impingement.
Although these conditions are different, they often overlap—and they can produce very similar symptoms. The good news is that both typically respond well to conservative care, particularly when hands-on treatment is combined with progressive rehabilitation.
What Is Rotator Cuff Tendonitis?
Rotator cuff tendonitis refers to irritation of one or more of the tendons that help stabilize and move your shoulder. The supraspinatus tendon is commonly involved, although other rotator cuff tendons and the long head of the biceps tendon can also be affected.
The term tendinopathy is often more accurate because tendon problems aren’t always caused by inflammation alone. Changes within the tendon can develop from repetitive stress, sudden increases in training volume, poor movement mechanics, or age-related changes.
You may notice:
An ache or sharp pain around the shoulder
Pain when reaching or lifting overhead
Tenderness around the affected area
Weakness with certain movements
Pain that becomes worse at night or when lying on the affected side
For athletes and active individuals, repetitive overhead activities such as throwing, swimming, volleyball, tennis, or weightlifting can place significant demands on the rotator cuff.
What Is Shoulder Impingement?
Shoulder impingement, sometimes referred to as subacromial impingement syndrome or subacromial pain, describes pain associated with the tissues in the space underneath the acromion, a portion of the shoulder blade.
The rotator cuff tendons and a fluid-filled structure called the subacromial bursa occupy this space. Certain shoulder movements can increase compression or irritation of these tissues, particularly during repeated overhead activity.
Pain is often felt along the outside or front of the shoulder and may be aggravated by:
Raising your arm overhead
Reaching behind your back
Repetitive overhead activities
Throwing or other sports
Sleeping on the affected shoulder
Over time, repeated irritation can contribute to tendon or bursal problems.
So, What’s the Difference?
This is where things can get confusing.
Tendinopathy involves the tendon itself, while shoulder impingement describes irritation or compression of structures within the subacromial region.
However, these conditions aren’t always completely separate.
An irritated or thickened tendon may become more sensitive to compression, while altered shoulder mechanics can increase stress on an already irritated tendon. This can create a cycle of pain, weakness, and restricted movement.
Because of this overlap, many healthcare professionals now use broader terms such as subacromial pain or rotator cuff-related shoulder pain rather than relying solely on structural labels.
This is also important when looking at imaging. Findings on an MRI or X-ray don’t always perfectly correlate with someone’s symptoms. In other words, what appears on an image isn’t necessarily the reason you’re experiencing pain.
That’s why a thorough history and physical examination are so important.
Why Does the Shoulder Hurt in the First Place?
Your shoulder doesn’t work in isolation.
The shoulder blade, thoracic spine, ribs, neck, and surrounding muscles all contribute to how efficiently the shoulder moves. Restrictions or weakness in one area can change how another area functions.
For example, limited thoracic mobility or poor scapular control may alter the way your shoulder blade moves when you raise your arm. This can place additional stress on the tissues around the shoulder.
A proper assessment looks beyond the painful spot to determine what may be contributing to the problem.
In some cases, imaging such as X-ray, ultrasound, or MRI may be appropriate to evaluate the tissues further or rule out more significant structural problems, particularly when symptoms aren’t improving as expected.
How Chiropractic Care and Rehabilitation Can Help
For most cases of rotator cuff-related shoulder pain and subacromial pain, conservative treatment is recommended before considering more invasive options.
This is where chiropractic care and rehabilitation can work extremely well together.
1. Restore Mobility
Hands-on treatment can address restrictions in the shoulder, upper back, ribs, and surrounding tissues.
Depending on the individual, treatment may include joint mobilization or adjustment, thoracic and rib work, and soft-tissue techniques such as myofascial release or instrument-assisted soft-tissue work.
Research has also found that thoracic manipulation can produce immediate improvements in shoulder pain and function in some patients with shoulder impingement, potentially through changes in shoulder and scapular mechanics.
The goal isn’t simply to “put the shoulder back in place.” It’s to help restore the movement your body needs to function efficiently.
2. Rebuild Strength and Control
Hands-on treatment is only part of the equation.
Exercise is one of the most important components of long-term shoulder recovery.
Rehabilitation may begin with gentle range-of-motion exercises and isometric strengthening before progressing toward more challenging exercises for the rotator cuff and shoulder blade.
Strengthening muscles such as the serratus anterior, middle trapezius, and lower trapezius can help improve scapular control and coordination during shoulder movement.
As your strength and tolerance improve, exercises can gradually become more specific to your sport, job, or daily activities.
3. Manage Your Training Load
Sometimes the problem isn’t that you need to stop moving—it’s that your shoulder is being asked to do more than it currently has the capacity to handle.
Your treatment plan should help you understand which activities are irritating your symptoms and how to modify them while continuing to build your capacity.
This gradual approach allows you to load the shoulder without repeatedly pushing it past its current tolerance.
Why Chiropractic Care + Rehab Is Such a Powerful Combination
Think of it this way:
Chiropractic care helps create movement.
Rehabilitation helps you own that movement.
Hands-on treatment can help improve mobility and decrease restrictions, while progressive exercise helps your muscles and tendons develop the strength and capacity necessary to maintain those improvements.
Research supports exercise as a cornerstone of conservative treatment for rotator cuff-related shoulder pain, and combining manual therapy with exercise may provide additional short-term improvements in pain and function.
The goal isn’t simply to make your shoulder feel better for a few days. It’s to help you move better, get stronger, and tolerate the activities that caused the problem in the first place.
How Long Does Recovery Take?
Every shoulder is different.
Some people experience meaningful improvements within several weeks of consistent treatment and appropriate exercise. Others—particularly those dealing with chronic symptoms or significant tendon changes—may require a longer, progressive rehabilitation program.
The key is consistency.
If your shoulder pain continues to interfere with your sleep, workouts, work, or everyday activities, don’t assume you simply have to live with it.
A proper assessment can help determine what’s contributing to your symptoms and whether conservative care is appropriate.
The Bottom Line
Tendonitis/tendinopathy and shoulder impingement aren’t necessarily two completely separate problems. They often overlap and can be influenced by the way the shoulder, shoulder blade, thoracic spine, and surrounding muscles work together.
The good news is that you don’t always need surgery or invasive treatment to get better.
A combination of chiropractic care, soft-tissue work, mobility treatment, and progressive rehabilitation can help address the different factors contributing to shoulder pain while gradually rebuilding strength and load tolerance.
If your shoulder is keeping you from sleeping, working out, playing your sport, or simply moving comfortably, don’t just work around it. Find out why it’s hurting and give your shoulder the tools it needs to get better.
