Achilles Tendinitis: Causes, Symptoms, and How to Fix It
Achilles tendinitis is pain and irritation in the Achilles tendon, the thick cord at the back of your heel, and it flares with overuse caused by excess walking, running, stairs, and pushing off. The most effective fix is not rest, it is progressive loading that rebuilds the tendon's capacity to load during activities. Research consistently shows that a heavy, progressive calf-loading program reduces pain and improves function for the large majority of people. However, this must be done in a safe manner, guided by a professional to avoid further injury. This guide covers what Achilles tendinitis is, why it happens, the exercises that help most, and how to fix it for good.
What is Achilles tendinitis?
Achilles tendinitis, more accurately called Achilles tendinopathy, is irritation and breakdown of the Achilles tendon, the tendon which connects your calf muscles to your heel, most often from overuse of the tendon. It shows up in two spots: most commonly in the mid-portion which is a few inches above the heel, or insertional which is right where the tendon meets the heel bone.
The name ends in "-itis," which suggests an inflamed tendon, but in most cases that is not what is actually going on. The real problem is that the tendon's fibers have become weakened and disorganized from being overworked, more like a rope that has slightly torn. That is why rest and ice alone do not fix it. They calm the pain down, but they do not rebuild anything. The tendon gets stronger the same way a muscle does. Gradually loading the tendon with exercise until it can handle the required load is the way to recover from this injury.
When completing a physical therapy evaluation for Achilles tendinitis, we look at the strength of the calf muscles. We also look at the muscles of the hip, along with the flexibility and range of motion of the ankle. Something as simple as counting single-leg heel raises on each side shows us how much capacity the tendon has lost compared to the other leg. Together, these measurements give us a clear picture of why the tendon is injured and exactly how we address it.
Achilles tendinitis symptoms
The most common Achilles tendinitis symptoms are pain and stiffness at the back of the ankle, worst with the first steps in the morning or after sitting. This pain eases as you warm up and then returns after activity. The tendon can feel thickened or tender to squeeze, and pushing off, running, and stairs tend to aggravate it. The pain usually builds gradually rather than from a single injury.
- Pain and stiffness at the back of the ankle, worst with the first steps in the morning.
- Symptoms that ease as you warm up, then return after activity.
- A tendon that feels thickened or tender when you squeeze it.
- Pain with pushing off, running, hills, and stairs.
What causes Achilles tendinitis?
Achilles tendinitis is an overload problem, usually from doing too much too soon: a spike in running mileage, hills, or speed work, a sudden return to activity, or new footwear. Calf weakness or tightness, limited ankle mobility, and foot mechanics all add stress to the tendon. Underneath most cases is the same theme, the tendon was asked to handle more load than it was ready for. That same pattern of a sudden training spike is what drives a lot of lower-leg overuse injuries, which is why Achilles pain and shin splints so often show up in the same runner during the same training block.
How to fix Achilles tendinitis
Since the problem is a tendon that fell behind its workload, the fix is catching it back up: loading it in a controlled, progressive way while temporarily dialing back what flares it. Complete rest is a trap, it calms the pain but leaves the tendon weaker, so it flares again on return. The evidence strongly supports progressive calf-loading, and the eccentric portion, the slow lowering phase, does much of the heavy lifting: studies report meaningful pain reduction in roughly 60 to 90 percent of people who stick with a loading program. A reasonable pain rule while you load it: low-level discomfort that settles by the next day is fine, sharp or worsening pain means back off the load. The way that load is built up week to week follows the same progressive overload principles we use across every rehab plan.
In my practice, loading progression for the Achilles usually starts with isometric calf holds to calm the tendon down, then builds into slow, heavy calf raises with both a straight and a bent knee, with extra emphasis on the lowering phase. From there we add faster, springier movement and a gradual return to running or sport, using how the tendon feels the next day as the guide for when to push and when to hold.
Exercises for Achilles tendinitis
The best Achilles tendinitis exercises are progressive calf-loading movements such as the heel raises. These usually start with isometrics (holding a calf-raise position) to calm pain, then progress to slow, heavy calf raises, both straight-knee (for the gastrocnemius) and bent-knee (for the soleus), and eventually to more dynamic and springy work as the tendon tolerates it. Eccentric loading, meaning a slow, controlled lowering of the heel under load, is the most-studied exercise approach for Achilles tendinopathy, going back to the classic heel-drop protocol where you rise up on both feet and lower down slowly on the injured side. Research on eccentric-focused programs consistently shows reduced pain and improved function in the majority of patients, which is why the slow lowering is where much of the rebuilding actually happens. Build up gradually and keep the discomfort low and settling by the next day.
Manual therapy and dry needling for Achilles tendinitis
A huge part of treating tendinopathy is the hands-on treatment which helps a stubborn tendon calm down. You will have an easier time progressing the exercises with a less reactive and less painful tendon. Dry needling helps to release those trigger points in a tight calf muscle and drives blood flow into the area, while cupping and scraping free up the tissue along the calf and improve mobility. Manual therapy and joint mobilizations restore ankle motion when it is limited, which takes stress off the tendon. None of this replaces the loading, it makes you comfortable enough to load the tendon properly, which is what actually fixes it. That pairing of hands-on care and well-dosed loading is how we approach tendon pain at Reclaim Physical Therapy.
How to prevent Achilles tendinitis
Keeping Achilles tendinitis from coming back comes down to a few habits:
- Build mileage and intensity gradually, and do not spike the amount of work you are doing at once.
- Keep the calves strong year-round with progressive calf raises, the single most protective step. This is the same principle behind preventing running injuries with strength training.
- Warm up properly before any running or athletic activities, and progress in new footwear slowly.
- Respect early warning aches rather than training through them.
When to see a physical therapist for Achilles pain
See a physical therapist if the Achilles pain has lasted more than a few weeks, keeps returning, limits running or walking, or is not improving with rest. A good evaluation prevents further damage to the tissue and builds a loading program around your tendon. Sudden, severe pain with a "pop" and difficulty pushing off needs prompt evaluation to rule out a tendon rupture. If your goal is getting back on the road, the same staged approach we use for returning to running after an injury applies to the Achilles.
How we treat Achilles tendinitis at Reclaim
At Reclaim Physical Therapy, we confirm what is driving your Achilles pain, calm the tendon with hands-on work, and build the progressive calf-loading program that rebuilds it. As a concierge, in-home sports physical therapy practice serving Miami Lakes and the surrounding area, the whole session comes to you, at home or wherever you train, one-on-one with a doctor of physical therapy.
Achilles pain slowing you down?
Book an in-home visit with Reclaim Physical Therapy and we will find why your Achilles hurts and build a plan to fix it. Serving Miami Lakes and nearby.
Ready to move past the pain?
Achilles tendinitis doesn't have to be your "new normal." At Reclaim Physical Therapy, we specialize in Achilles tendon recovery for patients in the Miami Lakes area. Experience concierge-style care tailored to your lifestyle, brought right to your door.
Frequently asked questions
Should I rest or exercise Achilles tendinitis?
Not complete rest. The tendon rebuilds by being loaded progressively. Dial back what flares it, but the fix is a controlled calf-loading program, not sitting still.
Why is my Achilles worse in the morning?
Morning stiffness that eases as you warm up is a classic Achilles tendinopathy sign. It comes from the tendon settling overnight.
How long does Achilles tendinitis take to heal?
Tendons rebuild slowly, so it depends on how long the tendon has been irritated. A mild, recently flared Achilles usually improves meaningfully within 6 to 12 weeks of a consistent loading program. A tendon that has hurt for months typically needs the full 12-week loading block as a starting point, with complete recovery commonly taking 3 to 6 months and improvements continuing up to a year. The earlier the rehab starts, the shorter the road.
Is it Achilles tendinitis or a tear?
Tendinitis builds gradually and aches with activity. A sudden pop, sharp pain, and trouble pushing off can signal a rupture and needs prompt evaluation.