The Achilles is the thickest, strongest tendon in the body — and the one most likely to complain when your activity changes faster than it can adapt. Most people notice it the same way: a stiff, tender cord at the back of the heel that is worst for the first ten minutes after getting out of bed, loosens as you move, then aches again in the evening.
That pattern is the signature of Achilles tendinitis. It is common, it is treatable, and it responds far better to early care than to waiting it out. Left alone for months, an irritated tendon thickens and becomes genuinely harder to settle down.
Two different problems that share one nickname
Where the pain sits matters more than most people expect, because it changes what actually helps.
- Midportion Achilles tendinitis is felt in the cord itself, roughly one to two inches above the heel bone. Squeezing that section is tender. This type usually responds well to a progressive loading program.
- Insertional Achilles tendinitis sits right where the tendon anchors into the back of the heel bone. It is often worse going uphill or in stiff-backed shoes, and it does not like the deep heel-drop stretches that help the midportion type. We treat it differently on purpose — more on that in our guide to insertional Achilles tendinopathy.
Pain slightly to the side or deep behind the tendon can also come from the bursa rather than the tendon, which is one reason a hands-on exam beats guessing from an internet checklist.
Why it lingers longer than people expect
- Blood supply. The midportion of the Achilles has a relatively poor blood supply, so repair is slow compared with muscle.
- Load spikes. Tendons adapt to gradual increases and rebel against sudden ones — a new running plan, a return to sport after winter, a job that suddenly has you on concrete all day.
- Calf tightness. A short, stiff calf keeps constant tension on the tendon through every step.
- Footwear. Flat, unsupportive shoes increase the strain; a rigid heel counter can dig directly into an inflamed insertion.
- Rest alone does not rebuild a tendon. It calms symptoms, then the pain returns at the same load, because nothing changed the tendon capacity.
What else can cause pain in the same spot
Not every sore Achilles is tendinitis, and a few of the look-alikes are treated quite differently. Part of the first visit is ruling these out rather than assuming:
- Retrocalcaneal bursitis. The bursa sits between the tendon and the heel bone. It produces tenderness that is deeper and more to the sides of the tendon than dead-centre, and it often swells visibly in a stiff shoe.
- Haglund’s deformity. A bony prominence on the upper back corner of the heel that irritates the tendon and bursa from underneath. Footwear changes matter far more here than stretching does.
- Posterior ankle impingement. Pain deep behind the ankle when you point the foot down, common in dancers and anyone with an os trigonum. It is provoked by pushing off, not by squeezing the tendon.
- Sural nerve irritation. Burning, tingling or numbness along the outer edge of the tendon rather than a dull ache — a nerve pattern, not a tendon one.
- Partial tearing within the tendon. Worth suspecting when a tendon that had been steadily improving suddenly regresses after one specific effort.
Thickening of both Achilles tendons in a younger adult occasionally points to an inherited cholesterol disorder, which is one of the few times we will suggest bloodwork through your primary care physician for what looks like a foot problem.
Signs you should be seen promptly
Get in quickly — or to an emergency department — if you felt a sudden pop or a sensation like being kicked in the back of the leg, if you cannot push off or rise onto your toes on that leg, or if there is a visible gap in the tendon. Those point toward an Achilles tendon rupture rather than tendinitis, and the timeline for treatment matters.
How we treat Achilles tendinitis at our Howell office
The first visit is an exam, not a script. We locate exactly where the tendon is tender, check calf flexibility and single-leg heel-rise strength, look at how you load the foot when you walk, and review the shoes you actually wear most. From there the plan is staged:
- Load management first. We reduce the aggravating load without shutting you down completely — the tendon needs some stimulus to remodel.
- A progressive loading program. Slow, heavy calf work is the best-supported treatment for Achilles tendinopathy. See our Achilles tendinopathy exercise guide for the general progression we build from.
- Heel lift and footwear changes to offload the tendon while it settles, particularly for the insertional type.
- Custom orthotics when foot mechanics are driving the strain rather than training volume alone.
- Night splints for the patients whose worst pain is those first morning steps.
- Shockwave therapy for stubborn tendons that have not responded to a properly executed loading program.
What a loading programme actually looks like
“Do heel raises” is where most home programmes start and stop, which is why so many stall. The progression matters:
- Stage one — isometrics. Holding a mid-range heel raise for 30–45 seconds, several times a day. This is for tendons too irritable to tolerate movement, and it often takes the edge off pain within a week.
- Stage two — heavy slow resistance. Both up and down phases, deliberately slow, with enough load that the last few repetitions are genuinely hard. Three sessions a week. This is the stage that rebuilds capacity, and it is the one people skip.
- Stage three — energy storage. Hopping, skipping and running drills reintroduced gradually, only once the heavy work is comfortable. Returning to sport without this stage is the most common reason the pain comes back.
The rule we give patients for judging load: discomfort during the exercise up to about five out of ten is acceptable, but it should settle within twenty-four hours and the tendon should not be stiffer the next morning. If it is, the load was too high — that is information, not failure.
How long does it take?
Most people feel meaningfully better within six to twelve weeks of consistent loading work, and insertional cases tend to sit at the longer end of that range. That is tendon biology, not pessimism — the fibres genuinely remodel on that timescale. What we can change is whether those weeks are spent doing the right work or the wrong work.
Who we tend to see this in around Howell
Achilles pain has seasons here. In spring we see runners and walkers who moved back outdoors and added hills or pace too quickly after a winter on flat treadmills. In fall it is high-school and rec-league athletes ramping up in cleats, which sit at a different heel height than the trainers they lived in all summer. Year round it is people whose jobs keep them upright on hard floors — nursing, trades, retail, warehouse work — where the tendon never gets a genuine rest day.
Two smaller groups matter clinically. Adults who have recently gained weight or started a new medication sometimes see tendon pain appear without any change in activity at all. And patients with diabetes or inflammatory arthritis can have tendon changes that behave differently, which is worth flagging at the first visit rather than the fourth.
Questions patients ask
Should I stretch it?
It depends on which type you have. Midportion tendinitis usually tolerates and benefits from calf stretching and heel-drop work. Insertional tendinitis often gets worse with deep heel drops that compress the tendon against the heel bone — which is exactly why the two are worth telling apart before you start a program you found online.
Can I keep running or working out?
Usually yes, at a modified volume. Complete rest tends to trade short-term comfort for a tendon that is no stronger when you return. We set a pain threshold you can work under and adjust from there.
Do I need an MRI?
Most cases do not. The diagnosis is largely clinical, and imaging is reserved for cases that are not behaving as expected, when a partial tear is suspected, or when we are weighing a procedure.
Will I need surgery?
The large majority of Achilles tendinitis is managed without surgery. Surgical discussion is reserved for tendons that have failed a genuinely well-executed course of conservative care over months, or for structural problems such as a large bone spur at the insertion.
Serving Howell and Livingston County
Our Howell office is at 4330 E Grand River Ave, Howell, MI 48843, and we regularly see patients from Brighton, Hartland, Pinckney, Fowlerville, and the surrounding townships. If you would rather start with an overview of everything we treat locally, see our Howell podiatrist page or our office locations. If your pain is under the heel rather than behind it, heel pain treatment in Howell is the better starting point.
To get an Achilles evaluated, call (810) 206-1402.