Orthopedic and movement
Tendinopathy: Achilles, Patellar, and Rotator Cuff
Expert-reviewed guidance on tendinopathy — why the name changed from tendinitis, why loading a painful tendon is the treatment, and how long it takes.
- Expert Reviewed
- Evidence Based
- Patient Focused
Persistent tendon pain is usually not inflammation, which is why the older term "tendinitis" has largely been replaced by "tendinopathy." What's typically happening is a change in the structure and quality of the tendon itself, generally in response to loads it wasn't prepared for. That distinction matters because it changes the treatment: rest and anti-inflammatories address inflammation that mostly isn't there, while progressive loading — gradually asking the tendon to do more — is what actually drives adaptation. Tendinopathy is slow. Meaningful improvement typically takes three months or more, and the most common reason people don't recover is stopping too early.
Why the name changed
"Tendinitis" implies inflammation. When persistent tendon pain is examined, inflammatory cells are largely absent. What's found instead is disorganized collagen, changes in cell populations, and increased blood vessel and nerve ingrowth.
"Tendinopathy" describes that more accurately — a change in the tendon's structure and capacity rather than an inflammatory process.
What causes tendinopathy
Almost always a mismatch between load and capacity.
Tendons adapt to what's asked of them, slowly. Problems arise when demand increases faster than the tendon can adapt — a sudden increase in training, a new activity, a return after time off, or a change in surface, footwear, or technique.
It isn't only athletes. A change in job, a new pair of shoes, or a burst of unaccustomed activity can do it.
Common sites: Achilles · patellar (jumper's knee) · rotator cuff · gluteal (lateral hip pain) · lateral elbow (tennis elbow) · medial elbow (golfer's elbow)
What helps with tendinopathy
Progressive loading. This is the treatment. The tendon needs to be asked to do gradually more, in a controlled way, over months. That is what drives structural adaptation, and nothing else has comparable evidence.
- A useful principle: some pain during loading is generally acceptable, provided it settles reasonably quickly and isn't worse the following morning. Your therapist should give you a specific guide for your situation — this is where individual guidance matters.
- Relative rest, not complete rest. Reduce the aggravating activity rather than stopping everything. Complete rest reduces capacity, and the tendon is then even less able to handle load when you resume.
- Physical therapy — assessment of what's driving the overload, a loading program, and a graded return to activity. → Find a physical therapist
- Addressing the cause. If a training increase, a technique change, or a new shoe triggered it, that needs looking at — otherwise it recurs.
What has weaker evidence: ultrasound, most passive modalities, and stretching alone. Anti-inflammatories may reduce pain short-term but don't address the underlying problem, and there are theoretical concerns about their effect on tendon adaptation.
Injections are sometimes considered where pain prevents any loading at all. Corticosteroid injection can provide short-term relief but has been associated with worse long-term outcomes in some tendons — a conversation to have carefully with your doctor.
What a course of physical therapy involves
- Assessment establishes which tendon, how irritable it currently is, and what caused the overload.
- A loading program matched to your current capacity, progressing over months.
- Frequency is usually low; consistency is everything. The work happens at home, most days, for a long time.
- Expect three months minimum before meaningful change, and longer for some tendons. The most common reason people don't recover is stopping when it starts feeling better.
Goals worth setting
Run 30 minutes without pain the next morning · Climb stairs without heel pain · Return to a full training week · Carry groceries without elbow pain · Sleep on that side
Reduce tendon pain · Improve tendon strength
What recovery usually looks like
- Slow, and not linear. Good weeks and bad weeks within an improving trend is normal.
- Pain during loading isn't necessarily harm. Within the guidance your therapist gives you, some discomfort is expected and acceptable.
- Morning stiffness is a useful marker. Tendinopathy characteristically produces stiffness on first getting up that eases with movement, and tracking it gives you a clearer picture than daily pain does.
- Recurrence is common if the underlying cause isn't addressed — which is why the conversation about training load, technique, or equipment matters as much as the exercises.
Related conditions
Conditions and pages that commonly come up alongside tendon pain.
Frozen shoulder
The other common cause of persistent shoulder pain, and a different problem entirely.
Learn more →Sports therapy for adults
Training load, return to activity, and the overload patterns behind most tendon pain.
Learn more →ACL reconstruction
Where patellar tendon pain frequently follows a graft taken from that tendon.
Learn more →Persistent pain
The wider picture on long-term pain, and what treatment can realistically offer.
Learn more →Find a physical therapist · Find an occupational therapist · Adult orthopedic therapy · All adult therapy
Frequently Asked Questions
Is tendinitis the same as tendinopathy?
Tendinopathy is the more accurate term. Persistent tendon pain generally doesn't involve inflammation — it involves changes in the tendon's structure and capacity. That's why rest and anti-inflammatories are less effective than people expect.
Should I rest a painful tendon?
Relative rest, not complete rest. Reduce the aggravating activity rather than stopping everything — complete rest reduces the tendon's capacity and makes it less able to handle load when you resume.
Why does loading help if it hurts?
Because the tendon adapts to load. Progressive, controlled loading drives structural change in a way rest can't. Some pain during loading is usually acceptable within the guidance your therapist gives you.
How long does tendinopathy take to recover?
Three months at minimum for meaningful change, and longer for some tendons. The most common reason people don't recover is stopping when it starts to feel better.
Do anti-inflammatories help?
They may reduce pain short-term but don't address the underlying problem, and there are theoretical concerns about their effect on tendon adaptation. Discuss with your doctor.
What about a steroid injection?
Corticosteroid injection can provide short-term relief, but it has been associated with worse long-term outcomes in some tendons. Worth a careful conversation with your doctor rather than a default.
Why does my tendon pain keep coming back?
The most common reason people do not recover is stopping when it starts feeling better. A loading program progresses over months, the work happens at home most days, and three months is the minimum before meaningful change. The other common reason is that the cause was never addressed — if a training increase, a technique change, or a new shoe triggered it, that needs looking at or it recurs.
Why did this happen?
Almost always a mismatch between load and capacity — a change in training, activity, footwear, or technique. Identifying it matters, because otherwise the problem recurs.
Sources
- American Academy of Orthopaedic Surgeons. Shoulder Pain and Common Shoulder Problems - OrthoInfo - AAOS. orthoinfo.org. Checked August 21, 2026.
Medical disclaimer. This page is for general educational purposes and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your individual situation. Seek urgent medical attention for any of the symptoms listed above.