Understanding Chronic Achilles Tendon Pain: Causes, Common Mistakes, and Effective Solutions

KEY TAKEAWAYS

• Chronic Achilles tendinopathy is the tendon's response to repeated load that has outpaced its capacity to adapt. It is a degenerative tissue process, not a simple inflammation.
• The two best-supported treatments in the published evidence are progressive calf loading programs: the Alfredson eccentric heel-drop protocol (1998) and the Beyer heavy slow resistance protocol (2015). Both have decades of clinical track record and randomised controlled trial support.
• Recovery is slow. Most cases need 12 weeks of consistent loading work before the pain meaningfully changes, and full return to running or sport often takes longer.
• Surrounding kinetic chain factors (hip and core strength, calf flexibility, footwear, training load) matter. They are supportive, not substitutes for the calf-Achilles loading work itself.
• Shockwave therapy for Achilles tendinopathy has a more complicated evidence picture than for some other tendons. A 2026 systematic review concluded that shockwave does not have clinically meaningful benefit over sham in pain or disability for either midportion or insertional Achilles tendinopathy. Two Achilles ruptures have been reported following focused shockwave in the published trials. We discuss this carefully in the article.
• Sudden severe pain after a snap or pop, inability to push off the foot, or a clear loss of strength is a red flag for a possible Achilles tear and warrants prompt medical evaluation, not rehabilitation work.

IN THIS ARTICLE

• What chronic Achilles pain actually is
• Why the pain persists (and what really drives it)
• What the evidence shows about treatment
• The honest picture on shockwave therapy for Achilles
• How treatment works at Unpain Clinic
• What to do at home
• When to see a physician
• FAQ

INTRODUCTION

Chronic Achilles tendon pain is one of the most common, and most stubborn, lower-limb conditions in active adults. The pattern is recognisable: an ache at the back of the heel or a few centimetres above it, worse first thing in the morning, worse after activity, never quite settling no matter how much rest is taken. The frustrating reality is that the standard advice (rest, stretch, ice, repeat) often makes it last longer rather than shorter, because rest alone does not produce the tissue adaptation that the tendon needs to recover.

This article walks through what chronic Achilles pain actually is, what the published evidence supports for treatment, what the evidence does not support, and how a structured plan is built. Some of what follows will be different from the standard "stretch and rest" advice, because the evidence does not really support that pattern.

This is general education, not individual medical advice. If your pain came on with a sudden snap or pop, if you cannot push off the foot or rise onto your toes, or if there is a visible gap at the back of the lower leg, treat it as a possible Achilles tendon rupture and get assessed by a physician before continuing.

WHAT IS CHRONIC ACHILLES TENDINOPATHY?

The Achilles tendon is the thick band of tissue that connects the calf muscles (the gastrocnemius and soleus) to the back of the heel bone (the calcaneus). It is the largest tendon in the body, and it transmits remarkable forces during walking, running, and jumping (often several times body weight in running and many times that in jumping).

When the tendon is asked to handle more load than it has been progressively prepared for, microscopic damage accumulates faster than the tendon can repair it. The result, over weeks and months, is a change in the tendon's structure. Collagen fibres become more disorganised. The cellular environment shifts. Small new blood vessels and nerve endings can grow into the tendon (neovascularisation), which is part of why chronic Achilles tendons are tender to touch.

The clinical pattern is most often called tendinopathy, which is more accurate than the older term tendinitis. The "itis" suffix implies active inflammation, and while there is some inflammation involved, the dominant picture in chronic Achilles pain is a degenerative tissue change, not classical inflammation. This matters for treatment, because the things that work well for inflammation (ice, anti-inflammatories, rest) do not produce the tissue adaptation that a degenerative tendon needs.

There are two main locations to know about.

Midportion Achilles tendinopathy is the most common pattern. The pain and tenderness are 2 to 6 centimetres above the heel bone, on the body of the tendon itself. This is where the published evidence base is strongest.

Insertional Achilles tendinopathy is at the attachment to the heel bone (the calcaneus). The pain pattern is similar, but the loading approach is slightly different (deep heel drops below the level of the step are typically avoided early in rehabilitation, because they compress the insertion).

A clinician's first job at an assessment is usually to tell these apart, because the treatment plan adjusts.

WHY DOES THE PAIN PERSIST?

There are a few recognisable reasons chronic Achilles pain stays chronic.

The tendon has not been progressively reloaded. Tendons adapt to load slowly, over weeks to months, in response to mechanical stimulus that is graded above what they are used to but not so high that it damages them. If the response to pain has been complete rest, the tendon has not received the stimulus it needs to remodel. When the rest stops and normal activity returns, the tendon is no stronger than when the pain started, and the cycle restarts.

The wrong kind of activity has continued. Continuing to run, jump, or do interval-style calf loading at the same level as before the pain started does not give the tendon a chance to adapt. The tendon stays in a perpetual "irritated" state.

Surrounding kinetic chain factors have not been addressed. Hip and core strength, ankle mobility, calf flexibility, footwear, surface, and training load all influence what the Achilles has to manage. Weak hip stabilisers shift load onto the calf and Achilles during running. Limited dorsiflexion increases peak tendon load with each step. Sudden increases in mileage or hill running push the tendon past its capacity. Addressing the Achilles loading directly is the main intervention, but ignoring these surrounding factors leaves the tendon vulnerable to a return of the same problem.

The diagnosis is incomplete. A few conditions can look like Achilles tendinopathy and need different management: a partial Achilles tear, a retrocalcaneal bursitis, a Haglund's deformity at the back of the heel bone, a posterior ankle impingement, or referred pain from the spine. A proper assessment helps rule these out.

The pain became disconnected from the tissue findings. After months of chronic pain, the nervous system can become more reactive than the tissue damage alone would predict. The tendon may have begun to remodel while the nerves are still amplifying the signal. This is real, and it changes how rehabilitation is paced.

WHAT DOES THE EVIDENCE ACTUALLY SHOW ABOUT TREATMENT?

This is the most important section of the article, because the standard advice for Achilles tendinopathy and the evidence-based treatment are not always the same thing.

Progressive calf loading is the primary evidence-based treatment. The pattern across decades of trials is consistent: programs that load the calf-Achilles complex in a progressive, structured way produce meaningful improvement in pain and function. There are two main protocols with the strongest evidence base.

The first is the 1998 Alfredson eccentric heel-drop protocol, published in the American Journal of Sports Medicine. The original protocol involves heel drops off the edge of a step, with the body weight transferred onto the affected leg, and the heel slowly lowered below the level of the step over about 3 seconds. The protocol calls for 3 sets of 15 repetitions with the knee straight and 3 sets of 15 repetitions with the knee slightly bent, twice a day, for 12 weeks. That is 180 repetitions a day. The protocol explicitly continues "into discomfort but not severe pain," which is a key point: complete avoidance of any pain is not the goal. The Alfredson protocol has become the reference standard for chronic midportion Achilles tendinopathy.

The second is the 2015 randomised controlled trial by Beyer and colleagues in the American Journal of Sports Medicine, which compared the Alfredson eccentric protocol against a heavy slow resistance (HSR) protocol. Heavy slow resistance uses both the lifting (concentric) and lowering (eccentric) phases of calf raises with progressively heavier load, performed 3 times per week (rather than twice daily). At 12 weeks and 52 weeks, both groups had similar clinical improvements (VISA-A scores increased from baseline to about 75 at 12 weeks and 87 at 52 weeks across both groups). Patient satisfaction at 12 weeks was higher in the HSR group, largely because the time commitment was much lower. The practical implication: both protocols work for chronic midportion Achilles tendinopathy, and the choice between them is often a question of which one a given patient can actually do consistently for 12 weeks.

For insertional Achilles tendinopathy, the same principle applies, with one modification: heel drops below the level of the step (which compress the insertion against the heel bone) are usually avoided in the early phase. Calf raises performed on flat ground or with the heel at the level of the step are the safer starting point.

Surrounding kinetic chain work supports the loading program. Hip and core strengthening, ankle mobility, and addressing training-load and footwear factors all contribute to long-term recurrence prevention. This work is supportive, not a substitute for the calf-Achilles loading itself. The published evidence base does not support the idea that strengthening the hips and avoiding calf loading produces better outcomes. The opposite is closer to the truth: the calf-Achilles loading is the main intervention, and the surrounding work makes the result hold.

Stretching alone does not resolve chronic Achilles tendinopathy. Calf stretching can have a role in maintaining ankle mobility if dorsiflexion is limited, but the literature does not support stretching as a stand-alone treatment for the tendinopathy itself. Aggressive calf stretching in an irritable tendon can actually flare it.

THE HONEST PICTURE ON SHOCKWAVE THERAPY FOR ACHILLES

Shockwave therapy is widely used for Achilles tendinopathy in clinical practice, including at our clinic. The evidence picture for the Achilles specifically, however, is more complicated than for some other tendons (lateral elbow, rotator cuff, plantar fasciitis), and it deserves an honest account.

Earlier systematic reviews (2017 onward) reported favourable evidence for shockwave therapy in chronic Achilles tendinopathy, particularly when combined with loading exercise. Many clinicians, including in this clinic, have used shockwave alongside loading programs based on that evidence.

The most recent and most rigorous systematic review changes the picture. The 2026 systematic review and meta-analysis by Korakakis and colleagues in the Journal of Orthopaedic and Sports Physical Therapy examined the randomised controlled trials of shockwave therapy for Achilles tendinopathy with rigorous methodology (Cochrane Risk of Bias 2, GRADE certainty assessment). The conclusion: there was no clinically meaningful benefit of shockwave therapy in pain or disability for either midportion or insertional Achilles tendinopathy, with evidence ranging from very low to moderate certainty. The authors recommend that shockwave should not be considered a routine treatment for Achilles tendinopathy at present, and that alternative treatments should be prioritised. Two Achilles tendon ruptures were also reported in the trials following focused shockwave therapy, which is a real safety signal worth surfacing.

This is a meaningful shift, and it matters for how we talk about shockwave for Achilles specifically.

The honest position at Unpain Clinic is the following.

The primary treatment we recommend for chronic Achilles tendinopathy is progressive calf-Achilles loading (Alfredson eccentric, Beyer heavy slow resistance, or a hybrid), supported by the surrounding kinetic chain work. This is what the strongest evidence supports.

Shockwave therapy for Achilles tendinopathy is a case-by-case conversation rather than a default recommendation, and we walk through the current evidence (including the Korakakis 2026 meta-analysis) honestly with patients before considering it. For some patients, particularly those who have plateaued on a fair trial of loading work, focused shockwave may still be discussed as part of the plan. For others, the conversation is straightforwardly that loading is the work, and there is no shortcut.

This is different from how shockwave is framed for some other tendons (lateral elbow, rotator cuff, plantar fasciitis), where the published evidence is more consistently favourable.

"The honest answer for chronic Achilles tendinopathy is that loading the tendon, progressively and consistently over 12 weeks or more, is what changes the picture. Other treatments support that work. They do not replace it." Uran Berisha, BSc Physiotherapy, Founder of Unpain Clinic

HOW DOES TREATMENT FOR CHRONIC ACHILLES PAIN WORK AT UNPAIN CLINIC?

At Unpain Clinic in Edmonton, treatment for chronic Achilles tendinopathy sits inside a structured assessment-and-plan process. The first visit is an assessment, not a treatment session, because the right plan depends on whether the tendinopathy is midportion or insertional, how chronic and severe the case is, what your training and activity demands are, and what has already been tried.

A typical first visit includes a full history of how the pain started, what aggravates and eases it, what loading the tendon has been under (running mileage, hiking, walking, work demands), what treatments have been tried, and what you want to get back to. The examination covers the Achilles itself (palpation tenderness, swelling, the Royal London Hospital test for midportion tenderness), calf strength and length, ankle mobility (particularly dorsiflexion), foot mechanics, and the surrounding kinetic chain (hip strength and control, single-leg balance, gait if relevant).

If the picture suggests a possible Achilles tear (sudden onset, palpable gap, positive Thompson test), we coordinate immediate physician referral for imaging before any rehabilitation work.

From there, the toolbox we draw on is built around what the evidence supports.

Physiotherapy with progressive calf-Achilles loading is the backbone. We work with patients on either an Alfredson-style eccentric program, a Beyer-style heavy slow resistance program, or a hybrid, depending on what the patient can realistically commit to for 12 weeks. The protocol is taught, dosed, and progressed in clinic, with the bulk of the work happening at home between visits.

Surrounding kinetic chain work is added based on assessment findings. Hip and gluteal strengthening, ankle mobility, calf flexibility (in patients with restricted dorsiflexion), foot intrinsic strengthening, and gait or training-load coaching where relevant.

Focused shockwave therapy is discussed case by case rather than offered as a default. As above, the most recent rigorous meta-analysis questions its effectiveness specifically for Achilles tendinopathy, and we are transparent about that with patients. In selected cases where the loading work has been done well for 12 weeks or more and the patient has plateaued, shockwave may still be considered. It is positioned honestly as a possible adjunct with mixed evidence, not as a primary treatment.

EMTT therapy is selectively used in cases where surrounding soft-tissue inflammation is part of the picture. As with shockwave, it is an adjunct, not a primary treatment.

Massage therapy supports the broader picture by addressing calf tightness, surrounding muscle tension, and trigger points during the rehabilitation phase.

The honest framing throughout is that this is a 12-week-minimum project. There are no shortcuts. Patients who come in expecting a quick fix usually get less out of treatment than patients who come in willing to do the loading work consistently.

WHAT TO REALISTICALLY EXPECT FROM A COURSE OF CARE

A reasonable timeline for chronic Achilles tendinopathy is 12 weeks of structured loading work as the minimum first phase, with continued maintenance and gradual return to activity over the months that follow.

The first noticeable change for most patients is the morning pain pattern: the first few steps getting out of bed are usually the most informative symptom. As the tendon starts to adapt, the morning pain shortens and softens before the activity pain changes. Many patients notice the first morning-pain shifts in weeks 3 to 6, with bigger improvements in tolerance for running, walking, and standing over weeks 6 to 12.

A few principles tend to separate the patients who recover well from the patients who plateau.

The first is consistency. The Alfredson protocol is 12 weeks of twice-daily heel drops. The HSR protocol is 12 weeks of three-times-weekly sessions. Either one works if it is actually done. Neither works if it is done for two weeks and then abandoned because the pain has not changed yet.

The second is the loading-pain principle. Both protocols are designed to be performed into mild discomfort, not severe pain. Some pain during and after the loading work is acceptable and even expected. Pain that gets significantly worse the next morning, or pain that stays elevated for more than 24 hours after the loading session, is a signal to back the load down (not to stop entirely).

The third is patience with the timeline. Tendons adapt slowly. Twelve weeks is the minimum, and many cases need longer. Patients who treat the program as a 12-week project rather than a 2-week experiment are the ones who get the result.

The fourth is the surrounding cast. Hip and core strength, ankle mobility, footwear, and a sensible training-load progression are what hold the result once the active loading phase is complete.

WHAT CAN I SAFELY DO AT HOME?

This is general education, not individual medical advice. The principles below assume you have been cleared by a clinician and that an Achilles tear has been ruled out. Specific dosing should be matched to your case by a clinician.

1. Modify the activity that flared it. Reduce running mileage, hill running, and high-intensity calf-loading exercises (jumping, plyometrics) during the early loading phase. Walking is usually fine if it does not flare the morning pain significantly. Cycling, swimming, and most upper-body work are usually fine.
2. Start with isometric calf holds in the early irritable phase. A double-leg or single-leg calf raise held at mid-range for 30 to 45 seconds, repeated 4 to 5 times, once or twice a day. Isometrics often settle the pain enough to allow the loading work to start. They are not the loading work itself.
3. Move to the structured loading program. Either an Alfredson-style eccentric heel-drop protocol or a Beyer-style heavy slow resistance protocol. The specifics matter, so this is best built with a clinician. The principles are: heavy enough that the last reps are challenging, slow enough that the eccentric (lowering) phase takes about 3 seconds, sustained for 12 weeks, into mild discomfort but not severe pain.
4. Modify the heel-drop for insertional Achilles tendinopathy. If the pain is at the heel attachment rather than midportion, avoid heel drops below the level of the step in the early phase. Calf raises on flat ground or with the heel at the level of the step are the safer starting point.
5. Build hip and core capacity. Single-leg balance work, gluteus medius strengthening (side-lying leg raises, banded hip abduction, side planks), and basic core control all take pressure off the Achilles during running and walking.
6. Address ankle dorsiflexion if it is limited. A calf stretch with the back leg straight (gastrocnemius) and with the back knee bent (soleus), held for 30 to 60 seconds, several times a day, is reasonable. Sharp pain during stretching is a signal to back off, not push through.
7. Look at training load and footwear. Sudden increases in mileage, new hill running, switching to minimalist shoes, or moving to a harder running surface are common triggers. A temporary heel lift or a more cushioned shoe sometimes helps during the early rehabilitation phase, particularly for insertional Achilles tendinopathy.
8. Be patient. The tendon adapts on a 12-week timeline. Two weeks of work and no change does not mean the program is not working. It means the program has had two weeks.

WHEN SHOULD I SEE A PHYSICIAN INSTEAD OF (OR ALONGSIDE) REHABILITATION?

The following are not "wait and see" situations. Contact your physician promptly, or seek emergency care if symptoms are severe.

• Sudden onset of severe Achilles pain, particularly with a snap or pop sensation and immediate difficulty bearing weight. This raises suspicion of an Achilles tendon rupture and needs urgent assessment.
• Inability to actively rise onto your toes or to push off the foot.
• A palpable gap or visible defect in the back of the lower leg.
• Significant bruising or swelling at the back of the leg after a specific incident.
• Numbness, tingling, or weakness traveling into the foot or up the leg.
• Pain that has not improved at all after 6 to 8 weeks of well-executed loading work.
• A combination of Achilles pain with unexplained weight loss, fever, or a known history of cancer.
• Long-standing pain that has not responded to a fair conservative trial and that is interfering significantly with sleep, work, or function.

FREQUENTLY ASKED QUESTIONS

What is the best exercise for chronic Achilles tendinopathy?

The two best-supported exercise approaches are the Alfredson eccentric heel-drop protocol (180 repetitions per day, split between knee-straight and knee-bent positions, for 12 weeks) and the Beyer heavy slow resistance protocol (heavy calf raises with both phases of the movement loaded, 3 times per week, for 12 weeks). The 2015 Beyer trial showed similar clinical outcomes between the two at 12 and 52 weeks. The choice is often a matter of which protocol a patient can actually do consistently. For insertional Achilles tendinopathy, deep heel drops below the level of the step are typically avoided in the early phase.

How long does chronic Achilles tendinopathy take to heal?

Tendon recovery is measured in months, not weeks. A reasonable expectation is 12 weeks of structured loading work as a minimum first phase, with continued maintenance and gradual return to activity over the months that follow. Many cases need longer. Patients who treat the program as a 12-week project rather than a 2-week experiment are the ones who get the result.

Should I keep running while doing rehabilitation?

This depends on the irritability of the tendon and where you are in the rehabilitation timeline. Running is usually reduced (in volume, intensity, hill work, and frequency) during the early loading phase, not eliminated entirely, and is progressively reintroduced as the tendon responds. The specifics are best matched to your case by a clinician. The principle is: enough load reduction to let the tendon recover, not so much that fitness is lost or the tendon stops being stimulated.

Does shockwave therapy work for Achilles tendinopathy?

The evidence picture for Achilles specifically has shifted. Earlier systematic reviews were favourable to shockwave for chronic Achilles tendinopathy. The most recent and most rigorous meta-analysis (Korakakis et al. 2026 in the Journal of Orthopaedic and Sports Physical Therapy) found no clinically meaningful benefit of shockwave over sham in pain or disability for either midportion or insertional Achilles tendinopathy, and reported two Achilles tendon ruptures following focused shockwave in the included trials. Based on this updated evidence, we discuss shockwave for Achilles on a case-by-case basis rather than offering it as a default. The primary treatment we recommend is progressive calf-Achilles loading.

Why is rest alone not enough?

Rest reduces the load on the tendon, which lets the irritation settle, but it does not produce the tissue adaptation the tendon needs to handle load again. When the rest ends and normal activity resumes, the tendon is no stronger than it was when the pain started, and the cycle restarts. Progressive loading is what shifts the tendon's capacity. Rest is one component of the early phase, not the treatment.

Is stretching good or bad for Achilles tendinopathy?

Calf stretching has a role in maintaining ankle dorsiflexion if your ankle mobility is limited. It is not, on its own, a treatment for the tendinopathy. Aggressive stretching of an irritable tendon can flare it. Stretching paired with progressive loading is reasonable. Stretching alone, without loading, does not change the underlying picture.

Can I prevent Achilles tendinopathy from coming back?

Recurrence is real, particularly if the underlying contributors (training load, calf strength, hip strength, ankle mobility, footwear) are not addressed. After the active rehabilitation phase, a maintenance program of 1 to 2 calf-loading sessions per week, alongside sensible training load progression, reduces recurrence risk meaningfully.

Do I need a doctor's referral to come to Unpain Clinic?

No referral is needed. Physiotherapists and chiropractors in Alberta practice as primary contact clinicians. Some insurance plans require a physician's note for reimbursement, so check your plan if you intend to claim. If the assessment suggests a possible Achilles tear or another issue that needs a physician's involvement, we coordinate that referral immediately.

Is treatment for Achilles tendinopathy covered by insurance?

Most extended health plans reimburse physiotherapy, chiropractic, and massage therapy under standard categories. Adjunctive treatments like shockwave and EMTT are typically billed under the supervising clinician's category where applicable. Public provincial health insurance does not typically cover any of this in a private clinic setting. Confirm with your plan, and a Health Spending Account through your employer can usually be used as well.

PATIENT TESTIMONIAL

“Firstly, I am a complete sceptic. Was recommended by a Chiropractor to see Uran Berisha, who was a founder and expert in shockwave therapy. I was struggling. As I hit 50, my knees, hips and ankles were really bothering me. Aching, creaking..... keeping me up at night. Throbbing during the day. Did some research... still a little sceptical.... but thought I’d give it a go. Best thing I ever did! After appointment one, everything felt 20% better for about a week. After appointment 2, 60% better all the way to appointment 3. After appointment 3... I feel $1m! All I can stay is..... “I can’t recommend this enough”..... trust me.... try it.”- Brian Hare

ABOUT THE AUTHOR

Written by Uran Berisha, Founder of Unpain Clinic and Medical Shockwave Institute. Uran has a Bachelor of Science in Physiotherapy and is an International Educator in Shockwave Therapy.

BOOK YOUR INITIAL ASSESSMENT

If you have chronic Achilles tendon pain that has not responded to rest, basic stretching, or single-discipline care, the next step is a proper assessment. We will look at where exactly the pain sits (midportion or insertional), what your loading history has been, what your kinetic chain looks like, and what realistic timeline fits your case. The plan we build is honest, structured, and based on what the evidence actually supports. No referral needed. No long contracts. Book your initial assessment with Unpain Clinic.

REFERENCES

1. Alfredson H, Pietila T, Jonsson P, Lorentzon R. Heavy-load eccentric calf muscle training for the treatment of chronic Achilles tendinosis. American Journal of Sports Medicine. 1998;26(3):360-366. https://pubmed.ncbi.nlm.nih.gov/9617396/
2. Beyer R, Kongsgaard M, Hougs Kjær B, Øhlenschlæger T, Kjær M, Magnusson SP. Heavy Slow Resistance Versus Eccentric Training as Treatment for Achilles Tendinopathy: A Randomized Controlled Trial. American Journal of Sports Medicine. 2015;43(7):1704-1711. https://pubmed.ncbi.nlm.nih.gov/26018970/
3. Korakakis V, Kotsifaki R, Sotiralis Y, Malliaras P. Shockwave Therapy for Midportion and Insertional Achilles Tendinopathy: A Nail in the Coffin? A Systematic Review With Meta-Analysis. Journal of Orthopaedic and Sports Physical Therapy. 2026;56(5):282-299. https://www.jospt.org/doi/10.2519/jospt.2026.13985