Physio Performance, Health & Fitness
Achilles Tendinopathy: Symptoms and Treatment for Runners
Achilles tendinopathy is one of the most common overuse injuries in runners, and it’s also one of the most frequently mismanaged, largely because outdated advice around complete rest and aggressive stretching still circulates widely despite the current evidence pointing firmly in a different direction.
This guide covers what’s actually happening in the tendon, why rest alone tends to fail, and the treatment approach with genuine research behind it.
What's Actually Happening in the Tendon
The Achilles tendon connects the calf muscles to the heel bone and absorbs enormous repetitive load during running, often several times body weight with every stride. Tendinopathy develops when the tendon is loaded beyond its capacity to adapt and recover, producing structural changes within the tendon tissue rather than the straightforward inflammation the older term “tendinitis” implied.
It typically develops gradually from a training error. A sudden increase in running volume or intensity, a return to running after time off without proper progression, or a change in footwear or surface are all common triggers.
It affects two distinct regions differently. Mid-portion tendinopathy, affecting the tendon a few centimetres above the heel, and insertional tendinopathy, affecting where the tendon attaches to the heel bone itself, respond somewhat differently to treatment, which is part of why an accurate assessment matters.
Recognising Achilles Tendinopathy
Pain and stiffness that’s often worst first thing in the morning, easing somewhat with the first few minutes of movement before potentially flaring again with continued activity.
Pain that builds gradually during a run rather than appearing suddenly, often present at the start, easing during the run, then returning afterward.
Localised thickening or tenderness along the tendon, sometimes visible as a noticeable swelling compared to the other side.
Why Complete Rest Often Fails
Rest reduces pain but doesn’t rebuild tendon capacity. A tendon that’s rested completely loses conditioning rather than gaining it, which means symptoms frequently return, sometimes worse, once running resumes without a proper reintroduction to load.
Aggressive stretching can aggravate an already irritated tendon, particularly for insertional tendinopathy, where deep stretching positions can increase compressive load exactly where the tendon is already struggling.
Treatment With Genuine Evidence Behind It
Progressive loading exercises, particularly heel raises, are the cornerstone of evidence-based treatment. Starting with controlled, tolerable loading and gradually increasing difficulty stimulates the tendon to adapt and strengthen, which rest alone cannot achieve.
Training load management runs alongside exercise. Reducing running volume to a tolerable level rather than stopping entirely, then progressively rebuilding, tends to produce better long-term outcomes than a full stop followed by an abrupt return.
Footwear and running technique review can identify contributing factors, particularly where a specific change preceded the onset of symptoms.
Shockwave therapy has solid supporting evidence for persistent Achilles tendinopathy. Our shockwave therapy service is frequently used alongside a loading programme for cases that have been present for some time.
Book an assessment at our clinic in Drogheda if Achilles pain is affecting your running. Our running injuries page covers our broader approach to this area, and current clinical guidance is published through Physiopedia.
Frequently Asked Questions
Not necessarily. Reducing volume to a tolerable level while starting a progressive loading programme tends to produce better outcomes than complete rest followed by an abrupt return.
Progressive heel raise exercises, starting controlled and gradually increasing difficulty, have the strongest supporting evidence for rebuilding tendon capacity.
Tendons stiffen overnight with reduced movement, so pain and stiffness are often most noticeable first thing before easing somewhat with the first few minutes of activity.
Recovery timelines vary considerably, but many cases show meaningful improvement within eight to twelve weeks of a properly structured loading programme, with more established cases taking longer.
Not usually. A thorough clinical assessment is generally sufficient, with imaging reserved for cases that aren’t responding as expected or where the diagnosis is unclear.