Achilles Tendonitis: What It Is and What Actually Works

The Achilles tendon connects your calf muscles to your heel bone and is used every time you walk, run, climb stairs, or rise onto your toes. It’s the strongest tendon in your body, but it’s also prone to overuse injury — the tendon may be strained from excessive stretch or forceful contraction, or, more commonly, it’s repeatedly overloaded and develops tiny micro-tears over time.

Damage typically occurs either directly at the heel (insertional) or near the tendon’s weakest point, one to two inches above the heel (mid-portion or non-insertional) — an area with relatively poor blood supply that’s especially prone to degeneration.

Achilles tendon injuries affect between 250,000 and 1 million people per year, most commonly middle-aged males between 30 and 50. Two-thirds of all cases involve athletes, and runners are up to 10 times more likely to develop the condition. If you have a prior Achilles injury, you’re at greater risk of injuring the opposite side. Having a foot arch that’s too high or too flat also increases risk.

Typical symptoms:

• Morning pain and stiffness are common early signs
• Symptoms usually increase with activity, especially walking or running
• Pain when rising onto your toes
• Walking downstairs stretches the tendon and typically worsens symptoms
• The irritated area may become firmly swollen, and ongoing irritation at the heel insertion point can produce a painfully elevated “pump bump”

What the Research Actually Shows

Eccentric exercise — a specific type of loading exercise emphasizing the lengthening phase of a muscle contraction — is the most well-studied conservative treatment for Achilles tendinopathy, and it genuinely works. A 2021 randomized controlled trial (Habets et al., Orthopaedic Journal of Sports Medicine) compared the classic Alfredson eccentric heel-drop protocol against a combined concentric-eccentric alternative (the Silbernagel protocol) in 40 recreational athletes. Both groups improved substantially on the VISA-A questionnaire, a validated Achilles tendon symptom score — from roughly 60 out of 100 at baseline to 89 (Alfredson group) and 83 (Silbernagel group) at one year, both highly significant improvements. Interestingly, more patients in the Silbernagel group reported feeling subjectively improved (77% versus 50%) despite the objective scores being statistically similar between groups — a reminder that patient experience and standardized scores don’t always move in perfect lockstep, and that either well-structured loading program is a reasonable, evidence-backed starting point.

For chronic cases that haven’t responded to standard conservative care, shockwave therapy is a genuinely strong option with real, growing evidence behind it. We’ve written a full breakdown of shockwave therapy for Achilles tendinopathy — including why treatments that only target inflammation, like anti-inflammatories or cortisone, tend to provide temporary relief at best, while shockwave stimulates the biological repair process that actually addresses degenerated tendon tissue.

Sever’s Disease — A Related but Different Condition in Kids

Sever’s disease (calcaneal apophysitis) is a painful swelling near the Achilles insertion in growing children and adolescents. It’s not the same condition as adult Achilles tendonitis — it occurs at the growth plate itself, a softer area of developing bone, rather than in the tendon tissue. It’s managed differently than adult tendinopathy and typically resolves as the growth plate matures, with appropriate activity modification in the meantime.

How We Treat It

• Chiropractic care addresses ankle and foot joint mechanics, and broader lower-extremity alignment issues (including hip abductor weakness) that can contribute to abnormal loading on the Achilles.
• Physical therapy builds a structured eccentric or concentric-eccentric loading program — the intervention with the strongest evidence behind it — tailored to your specific presentation and stage of recovery.
• Massage therapy addresses calf tightness that contributes to increased tendon strain.
• Shockwave therapy is a strong option for chronic, stubborn cases that haven’t responded to standard loading programs.

FAQ

Should I stretch my Achilles tendon? Gentle stretching within a comfortable range can be part of a treatment plan, but structured eccentric loading exercise — not just stretching — is what the strongest evidence actually supports for meaningful, lasting improvement.

How long does Achilles tendonitis take to heal? Based on the research, meaningful improvement with a structured loading program typically develops over 12 weeks, with continued improvement over the following year in many cases. Achilles tendinopathy is a slower-healing condition than many soft tissue injuries, given the tendon’s naturally limited blood supply.

Is Sever’s disease the same as Achilles tendonitis? No. Sever’s disease affects the growth plate in children and adolescents, not the tendon tissue itself, and is managed differently than adult tendinopathy. It typically resolves as the growth plate matures.

Can I keep running with Achilles tendonitis? Often yes, with modification — complete rest isn’t usually necessary or even ideal, since the tendon still needs appropriate loading to remodel properly. We’ll guide you on the right level of activity and how to structure your loading program.

When should I consider shockwave therapy instead of just exercise? When a properly structured loading program over several months hasn’t produced the improvement you’d expect, or if you’re dealing with a more chronic, longstanding case. Shockwave and loading exercise aren’t mutually exclusive — many patients benefit from both together.

Image on this page provided by ChiroUp.