Ankle tendonitis is not one condition. Four different tendons, at the back, inside, outside and front of the ankle, produce four problems with four different treatments. All of them respond to progressive loading rather than rest, and one of them, the posterior tibial tendon, needs seeing early because an arch that collapses does not come back.
That is the part most pages on this subject leave out. They treat ankle tendonitis as a single thing, prescribe rest, ice and anti-inflammatories, and send you away. Locating the pain takes 30 seconds and changes everything that follows.
Which tendon is it?
FOUR TENDONS, FOUR DIFFERENT PROBLEMS
does it
hurt?
BEHIND, THE ACHILLES
The thick cord above the heel. Stiff for the first steps in the morning, easing as you warm up, sore again after the run. Much the most common.
INSIDE, THE POSTERIOR TIBIAL
Behind the inner ankle bone, running under the arch. Aching along the inside of the ankle, and an arch that is slowly flattening. The one that must not be missed.
OUTSIDE, THE PERONEALS
Behind the outer ankle bone. Usually turns up weeks after a sprain that never quite settled, and hurts on uneven ground.
FRONT, THE TIBIALIS ANTERIOR
Across the top of the ankle and foot. Comes from downhill walking, from a jump in mileage, and very often from laces tied too tightly over that spot.
Behind the ankle: the Achilles
The Achilles is the commonest source of ankle tendon pain by a wide margin, and it splits into two types that are managed almost oppositely.
Mid-portion Achilles tendinopathy hurts two to six centimetres above the heel bone, in the substance of the cord itself. Squeeze it between finger and thumb and you find a thickened, tender segment. This is the type with the best evidence behind it and the most reliable recovery.
Insertional Achilles tendinopathy hurts right at the back of the heel, where the tendon attaches to the bone. It is more stubborn, it takes longer, and it is the reason the general advice to stretch your calf is wrong for some people. Stretching pulls the tendon hard against the back of the heel bone, and that compression is part of what is causing the pain.
The pattern is the same for both and it is the signature of tendon pain in general: stiff and sore for the first steps of the morning, easing after 10 minutes of walking, comfortable during the activity itself, and worse a few hours afterwards or the following day. A broad ache under the heel or spread across the arch that behaves the same way is more often coming from the fascia under the foot than from any of these four tendons.
The inside of the ankle: the posterior tibial tendon
This is the one to know about, because it is the one where waiting costs you something.
The posterior tibial tendon runs behind the bony bump on the inside of your ankle and fans out underneath the arch of the foot. Its job is to hold the arch up and to lock the foot into a rigid lever every time you push off. When it stops doing that job properly, the arch progressively drops, the heel drifts outwards, and the whole shape of the foot changes.
Early on it presents simply as an ache along the inside of the ankle, worse after standing or walking, and it is easy to dismiss. Three checks are worth doing.
Look at both feet from behind, standing, in a mirror or with someone else looking. If you can see more toes on the outside of one foot than the other, that foot is drifting.
Compare the arches standing and sitting. An arch that is present sitting and disappears standing on the affected side is a warning.
Try a single-leg heel raise. Stand on the affected leg alone and rise onto your toes. If you cannot do it, or can only manage one or two where the other side manages 10, that tendon is failing.
If any of those three is positive, get it looked at rather than working through this page alone. Early posterior tibial problems respond very well to strengthening and an arch-supporting insole. Late ones end up as a fixed flat foot that requires surgery.
The outside of the ankle: the peroneals
Two peroneal tendons run behind the bony bump on the outside of the ankle. Their job is to turn the foot outwards and to stop it rolling over on uneven ground.
Peroneal tendinopathy is very often a delayed consequence of an ankle sprain. Somebody rolls their ankle, the swelling settles in a fortnight, they go back to normal, and six weeks later a nagging ache appears on the outside of the ankle that will not shift. What has usually happened is that the balance and control lost in the original injury was never restored, so the peroneals have been working overtime ever since.
That makes balance work as important as strengthening here. Standing on one leg while cleaning your teeth is a genuinely useful exercise for this particular problem, and it costs you nothing.
The front of the ankle: the tibialis anterior
Pain across the top of the ankle and the front of the foot, worse going downhill, is usually the tibialis anterior tendon or the extensor tendons running alongside it.
Two causes account for most cases and both are easy to fix. The first is downhill walking or running, because the front of the ankle works hardest controlling the foot as it lowers to the ground on a descent. The second is lacing, and it is surprisingly common: laces pulled tight across exactly the spot where those tendons run compress them against the bones underneath. Skipping one eyelet over the sore point, or lacing around it, often settles a mild case on its own.
Why the word tendonitis is misleading here too
The “itis” suffix means inflammation, and for the first few weeks of a genuinely new problem that is roughly right. Beyond that it is not. Tissue taken from tendons that have hurt for months contains almost no inflammatory cells. What it contains is disorganised collagen, a thickened tendon and new blood vessels and nerve endings growing into it.
A review in the British Medical Journal made that argument in 2002 and proposed the word tendinopathy. The reference primer on the whole subject, published in Nature Reviews Disease Primers in 2021, was led from the University of Glasgow by Neal Millar with Iain McInnes among the authors, and it tells the same story. That is worth knowing for a British reader for a practical reason: the group that assembled the modern account of tendon disease is working in a Glasgow hospital, and the message from that work is that load, not rest, is the treatment.
Which brings us to rest
Rest is the single most common piece of advice given for ankle tendonitis, including by several of the pages that rank highest for it, and taken literally it is wrong.
A tendon that is completely unloaded for weeks becomes weaker, not stronger. Collagen turnover falls, the tissue becomes less able to tolerate load, and the moment you go back to normal walking you are asking a weaker structure to do the same job that broke the stronger version. This is why so many people describe a cycle of resting, feeling better, restarting, and being back at square one within a fortnight. The same relapse cycle runs in the tendons of the arm, for exactly the same reason.
What is genuinely useful is relative rest: reducing the specific activity that provokes it while keeping the tendon working. Drop the hills, halve the distance, take the speed work out, and keep walking on the flat.
How much load is the right amount
settled within an hour
keep going
rest of the evening
hold this level
the next morning
reduce next session
The exercise for each tendon
| Tendon | Key exercise | What to avoid early on | Typical timeline |
|---|---|---|---|
| Achilles, mid-portion | Heel drops off a step, slow lowering, 3 sets of 15 twice a day | Hill running and speed work | 12 weeks |
| Achilles, insertional | Calf raises on flat ground only, never dropping below level | Any stretch of the calf, and stiff-backed shoes | 12 to 24 weeks |
| Posterior tibial | Single-leg heel raises, then resisted inward turning of the foot | Long walks on flat, unsupportive shoes | 12 weeks, and see someone early |
| Peroneal | Resisted outward turning of the foot, then balance work | Uneven ground, trail running, worn-out shoes | 8 to 12 weeks |
| Tibialis anterior | Slow toe raises with the heel on the floor | Downhill walking, and tight laces over the sore point | 6 to 8 weeks |
The Achilles programme deserves a little more detail because it has the strongest evidence behind it. Hakan Alfredson published it in 1998 on 15 athletes who had failed to improve over an average of 18 months. All 15 were back to their previous level after 12 weeks of daily exercises. The protocol is unglamorous: stand with the ball of the foot on a step, rise up using both legs, transfer your weight to the painful leg, then lower the heel below the level of the step slowly. 3 sets of 15, twice a day, every day.
Two adaptations matter. If the pain is at the insertion, at the very back of the heel, do the same exercise on flat ground and never let the heel drop below level. And later reviews have shown that other forms of loading, including heavy slow resistance work done three times a week, produce comparable results, so if the twice-daily version is unmanageable there is a workable alternative.
Footwear and training load
Most ankle tendon problems are overuse injuries in the literal sense: the tissue was asked to do more than it was prepared for. That usually means one of four things happened in the weeks before it started.
A jump in mileage or in walking distance. A change of surface, particularly onto pavement or onto a treadmill’s constant gradient. A change of shoes, especially into a lower-drop model, which shifts load onto the Achilles. Or a new activity taken up enthusiastically.
The 10 per cent rule, increasing weekly volume by no more than about a tenth, is a crude guide but it is better than nothing. More useful is treating the next-morning rule above as your training plan: if your ankle is stiff and sore the morning after a session, the session was too much regardless of what the plan said.
On shoes, three specifics. A small heel raise in both shoes helps insertional Achilles pain. An arch-supporting insole genuinely helps posterior tibial problems. And a shoe with a worn-out, collapsed midsole makes everything on this page worse.
Getting seen for it in the UK
In most of England you can refer yourself directly to community musculoskeletal services without seeing a GP first, and every adult in England can now see a first contact physiotherapist at their own GP practice without an appointment with the GP. For a problem that is diagnosed by locating a tender point and treated with graded exercise, that is the right door and usually the faster one.
What a physiotherapist adds is worth spelling out, because people often expect a passive treatment and get something else. They will confirm which tendon it is, test the strength of the calf and the small muscles that control the foot and ankle, watch you walk, and then build the loading programme around what they find. American sites call this physical therapy and the NHS calls it physiotherapy, but it is the same work. If the picture is complicated, or if the arch has already changed shape, they will refer you on to a foot and ankle service.
Manual therapy, ultrasound and other passive treatments may help the comfort of the first weeks. They do not substitute for the loading, and any course of treatment that never gets round to giving you exercises is not treating the problem.
Book a GP appointment instead if the ankle is hot, red and swollen, if you have a fever, if you cannot bear weight, if the pain followed a snap or a pop during activity, if you have numbness or pins and needles, or if the arch of one foot is visibly flatter than the other. That last one is the posterior tibial warning sign, and it is the one worth acting on quickly.
Steroid injections are used far more cautiously around the ankle than elsewhere, and with good reason: injecting near a weight-bearing tendon, particularly the Achilles, carries a rupture risk. If one is offered, ask specifically what is being injected and where.
Where a supplement fits
Nothing you swallow rebuilds collagen. The loading does that, and there is no shortcut through it. What a bioavailable anti-inflammatory can reasonably do is make the first few weeks tolerable enough that you get the programme started, and support the background terrain in someone dealing with several irritable tendons rather than one. That terrain has a marker of its own, a high-sensitivity CRP, which sits below the threshold a routine panel reports.
If that is your situation, our tendon support formulation is built around that constraint, and the absorption problem it is designed to solve is explained on the bioavailable natural anti-inflammatory page. Neither replaces the 12 weeks.
Frequently asked questions
How do you treat tendonitis in your ankle?
Work out which tendon it is, then load that tendon progressively rather than resting it. For the Achilles that means slow heel drops off a step. For the posterior tibial it means single-leg heel raises and resisted inward turning. For the peroneals, resisted outward turning and balance work. Reduce the aggravating activity rather than stopping altogether, and judge every session by how the ankle feels the next morning.
How long can ankle tendonitis take to heal?
Six to eight weeks for a recent tibialis anterior problem, 12 weeks for a straightforward Achilles or peroneal one, and up to six months for an insertional Achilles tendinopathy that has been grumbling for a year. Tendon tissue remodels over months. The commonest reason it drags on past that is not a difficult tendon, it is a programme that was abandoned in week three when nothing had changed yet.
What does ankle tendonitis feel like?
A sore, localised point you can press with one finger, stiff for the first steps in the morning, easing as you warm up and worse again a few hours after activity. That warm-up pattern is the signature of a tendon problem and is what separates it from a joint problem, which tends to get worse the longer you are on it. Sharp pain with swelling and bruising after a specific moment is an injury, not tendonitis.
Is it okay to walk with ankle tendonitis?
Yes, and complete rest is usually the wrong answer. A tendon that is unloaded for weeks becomes weaker and less able to tolerate what it could manage before. Keep walking on the flat, drop the hills and the distance, and use the next-morning rule to set the amount. The exception is a posterior tibial problem with a visibly flattening arch, where long walks in unsupportive shoes should stop until you have been assessed.
Should I use ice or heat for ankle tendonitis?
Ice for the first week or two if the area is genuinely swollen and warm, 10 minutes at a time, and heat later on for the stiffness. Neither changes the outcome. They make things more comfortable, which matters mainly because comfort is what lets you do the exercises, and the exercises are what actually rebuild the tendon.
Do I need special shoes or orthotics?
Sometimes, and it depends entirely on which tendon. For posterior tibial problems an arch-supporting insole genuinely takes load off the tendon and is worth having. For insertional Achilles pain, a small heel raise helps and a stiff-backed shoe hurts. For tibialis anterior pain, the fix is often just lacing the shoe differently to take pressure off the sore spot. There is no general orthotic for ankle tendonitis.
When should I see a doctor about ankle tendonitis?
See a GP if the ankle is hot, red and swollen, if you cannot put weight on it, if the pain followed a specific injury with a snap or a pop, if you have numbness or pins and needles, or if the arch of your foot is visibly flattening compared with the other side. Otherwise, in most of England you can refer yourself straight to community MSK physiotherapy without going through a GP at all.
What to take away
Put one finger on the sorest point, right now, and match it to one of the four tendons. Behind the heel, inside the ankle, outside the ankle, or across the front. Everything else on this page follows from that answer.
Then start the exercise for that tendon today rather than resting and waiting, and judge each session by how the ankle feels the following morning rather than during the session itself. And if the arch of one foot looks flatter than the other, stop self-managing and get that looked at this month, because it is the one version of ankle tendonitis where time is genuinely against you.
Sources
Alfredson H., Pietila T., Jonsson P., Lorentzon R. (1998). Heavy-load eccentric calf muscle training for the treatment of chronic Achilles tendinosis. American Journal of Sports Medicine, 26(3), 360-366. DOI: 10.1177/03635465980260030301
Khan K.M., Cook J.L., Kannus P. et al. (2002). Time to abandon the “tendinitis” myth. British Medical Journal, 324(7338), 626-627. DOI: 10.1136/bmj.324.7338.626
Cook J.L., Purdam C.R. (2009). Is tendon pathology a continuum? A pathology model to explain the clinical presentation of load-induced tendinopathy. British Journal of Sports Medicine, 43(6), 409-416. DOI: 10.1136/bjsm.2008.051193
Millar N.L., Silbernagel K.G., Thorborg K. et al. (2021). Tendinopathy. Nature Reviews Disease Primers, 7, 1. DOI: 10.1038/s41572-020-00234-1
Sivrika A.P., Papadamou E., Kypraios G. et al. (2023). Comparability of the effectiveness of different types of exercise in the treatment of Achilles tendinopathy: a systematic review. Healthcare, 11(16), 2268. DOI: 10.3390/healthcare11162268
