The most effective treatment for Achilles tendonitis is a structured loading program that gradually strengthens the tendon over 12 weeks. While rest and ice can ease the initial flare, tendons actually heal by being loaded in a controlled way, not by being immobilized. Most people recover fully without surgery, but the process takes patience: expect three to six months before the tendon feels reliably normal, and up to nine months before returning to high-impact activity.
Quick Pain Relief With Isometric Holds
When your Achilles is throbbing and you need relief right now, isometric exercises (holding a contraction without moving the joint) can help. Research from the International Association for the Study of Pain found that a single bout of heavy isometric calf holds reduced tendon pain almost instantly, with the effect lasting at least 45 minutes. The protocol is simple: hold a calf raise at the top position for 45 seconds, rest for two minutes, and repeat five times. If standing body-weight holds are too painful, start with a seated calf raise using light resistance to reduce the load on the tendon.
One important detail: avoid letting your ankle bend past neutral into a deep stretch during these holds. Tendons don’t respond well to compression, and pushing into a stretched position can compress the Achilles where it attaches to the heel bone, making things worse.
Where Your Pain Is Matters
Achilles tendonitis comes in two forms, and identifying which one you have shapes the best approach. Midportion tendonitis, the more common type, causes pain and thickening in the middle of the tendon, roughly two to six centimeters above the heel. Insertional tendonitis causes pain right where the tendon connects to the heel bone and is sometimes accompanied by a bony bump at the back of the heel.
The distinction matters because the gold-standard exercise protocol works differently for each type. Midportion tendonitis responds well to the full eccentric heel drop program (described below). Insertional tendonitis requires a modified version that avoids dropping the heel below the level of the step, since that position compresses the already irritated attachment point. If your pain is right at the heel bone, stick to flat-ground versions of the exercises or perform them on a step but only lower to the step level, not below it.
The Eccentric Heel Drop Protocol
The most studied and recommended exercise for Achilles tendonitis is the Alfredson eccentric heel drop. “Eccentric” means you’re loading the tendon as it lengthens, which stimulates the collagen remodeling that repairs damaged tissue. Here’s how it works:
- Starting position: Stand on the edge of a step or sturdy platform with the balls of your feet on the edge and your heels hanging off.
- The movement: Rise up onto your toes using both legs, then slowly lower on the injured leg only, letting your heel drop below the step over about three seconds. Use your good leg and your arms to push back up. You never push up with the injured leg.
- Two variations: Perform the exercise with your knee straight to target the upper calf muscle, then repeat with your knee bent to about 45 degrees to target the deeper calf muscle.
- Volume: 3 sets of 15 repetitions of each variation, twice daily, seven days a week for 12 weeks.
That’s 180 repetitions per day, which sounds like a lot. The protocol is meant to be mildly uncomfortable. Some pain during the exercise is expected and acceptable, but it shouldn’t be severe or get worse over the course of the session. If body weight alone is too easy after a few weeks, you can add resistance by holding dumbbells or wearing a weighted backpack.
Most people notice meaningful improvement by weeks six to eight, but the full 12 weeks are important for building durable tendon strength. Stopping early when the pain fades is one of the most common reasons for relapse.
Shoes, Heel Lifts, and Daily Modifications
A small heel lift inside your shoe can reduce strain on the Achilles by shortening the distance the tendon has to stretch with every step. Lifts in the range of 6 to 12 millimeters tend to work well. Going beyond 12 millimeters of heel-only lift usually becomes uncomfortable or unstable inside a shoe, so if you need more relief than that, a shoe with a higher built-in heel drop (like a traditional running shoe with a 10 to 12 mm drop) is a better option than stacking inserts.
Flat shoes, minimalist footwear, and walking barefoot all increase the demand on your Achilles. During the acute phase, switching to supportive shoes with a moderate heel can meaningfully reduce daily irritation. This isn’t a permanent change, just a way to keep the tendon comfortable while you’re working through the loading program.
Shockwave Therapy
Extracorporeal shockwave therapy uses acoustic pulses directed at the tendon to stimulate blood flow and tissue repair. It’s typically delivered once a week for five weeks. A study comparing outcomes in both insertional and midportion tendonitis found significant pain improvement at three months, with benefits holding steady at the five-year follow-up. Pain scores dropped to about 1 out of 10 for the insertional group and 2 out of 10 for the midportion group.
Shockwave therapy is generally considered a second-line option, worth trying if several months of structured exercise haven’t produced enough improvement. It’s noninvasive and doesn’t require downtime, which makes it appealing for athletes or active people who can’t afford a long break from training.
PRP Injections: Not What They Promise
Platelet-rich plasma injections have been heavily marketed for tendon problems, but the evidence for Achilles tendonitis is disappointing. A well-designed randomized trial published in JAMA compared PRP injections to a placebo (saline injection) in people with chronic Achilles tendonitis. Both groups improved equally over 24 weeks, with no difference in pain scores, function, satisfaction, or return to activities. PRP was not superior to placebo. Given the cost and the lack of evidence, it’s hard to justify PRP as a treatment for this condition.
When Surgery Becomes an Option
Surgery is reserved for people who have exhausted conservative treatment and still can’t tolerate their symptoms. The general threshold is at least six months of consistent, structured nonoperative care without adequate improvement. For insertional tendonitis, the procedure typically involves cleaning up damaged tendon tissue, removing any inflamed bursa, and shaving down the bony bump if one is present.
Recovery from Achilles surgery follows a structured timeline. The first two weeks involve no weight bearing and a splint or cast. By week two to four, you transition into a walking boot and begin bearing weight. By week eight, most people are out of the boot and starting gentle heel raise progressions. Running and jumping typically begin between weeks 12 and 16, and return to sport falls in the six-to-nine-month range, sometimes up to 12 months depending on the demands of the activity.
What a Realistic Timeline Looks Like
One of the most frustrating things about Achilles tendonitis is that it doesn’t heal on a muscle’s timeline. Tendons have a limited blood supply and turn over collagen slowly, so even with perfect adherence to an exercise program, you’re looking at three to six months for most cases. People who have had symptoms for a year or more before starting treatment often take longer.
The progression isn’t always linear either. You might feel great for two weeks and then have a flare after overdoing it on a weekend hike. That’s normal and doesn’t mean you’ve re-injured the tendon. The key is to keep loading consistently, adjust intensity when needed, and resist the urge to either push through sharp pain or stop exercising entirely. The tendon needs a steady, progressive stimulus to remodel, and the biggest predictor of success is simply sticking with the program long enough for it to work.