Condition Guide · Brighton & Hove
Achilles pain that won't resolve with rest is one of the most common and most mismanaged tendon problems. The right approach changes outcomes significantly.
Understanding the Condition
Achilles tendinopathy is a painful degenerative condition of the Achilles tendon, the large tendon connecting the calf muscles to the heel bone. It is characterised by stiffness and pain, typically worst first thing in the morning or after periods of rest, that eases with gentle movement and returns after prolonged activity.
The condition is most common in runners, jumping athletes and active adults over 35, though it is also seen in less active individuals where the tendon has been subjected to sudden or unaccustomed load. It is the result of tendon degeneration rather than inflammation, which is why anti-inflammatory medication, rest and ice, the traditional management approach, frequently fails to resolve it.
Tendons adapt to load by remodelling their structure. When load is removed, the tendon loses the stimulus it needs to repair and strengthen. Rest reduces pain in the short term but does nothing to address the underlying degeneration, which is why Achilles pain so often returns when activity resumes. The evidence strongly supports progressive loading as the primary treatment, not rest.
Achilles tendinopathy develops when the cumulative load applied to the tendon exceeds its capacity to adapt. This typically occurs through a sudden increase in training volume or intensity, a return to activity after a period of inactivity, a change in footwear or running surface, or sustained loading without adequate recovery. Calf weakness and reduced ankle mobility are almost universally present and are key contributing factors.
Age over 35, male sex, increased BMI, type 2 diabetes, fluoroquinolone antibiotic use (ciprofloxacin in particular carries a significant tendon rupture risk), and corticosteroid injections all increase tendon vulnerability. If you have taken fluoroquinolone antibiotics recently and develop Achilles pain, seek assessment promptly.
Two Distinct Presentations
Achilles tendinopathy occurs in two distinct locations, each with different characteristics, different aggravating factors and critically, different treatment approaches.
Pain and thickening in the middle of the tendon, 2-6cm above the heel bone. The most common presentation. Aggravated by running, jumping and prolonged standing. Responds well to heavy slow resistance loading, particularly eccentric heel drops. Compression is not a primary driver so certain stretches and exercises that would worsen insertional tendinopathy are appropriate here.
Progressive tendon loading programme, heavy slow resistance training, addressing calf weakness and training load management.
Pain at the point where the tendon meets the heel bone. Often accompanied by a bony prominence (Haglund's deformity). Critically, this presentation is aggravated by compression of the tendon against the heel, meaning certain common exercises, including full range eccentric heel drops, can significantly worsen it. Management requires a modified approach.
Applying mid-portion treatment protocols to insertional tendinopathy is a common clinical error that delays recovery. Accurate diagnosis is essential before starting any loading programme.
Common Misconceptions
"I need to rest it completely"
Rest reduces pain but does not promote tendon healing. Tendons need progressive load to remodel and strengthen. Complete rest followed by a return to activity almost always results in recurrence.
Progressive loading is the primary treatment
Heavy slow resistance training, specifically designed to load the tendon progressively, is the most evidence-supported intervention for Achilles tendinopathy and produces lasting structural change in the tendon.
"Anti-inflammatories will fix it"
Achilles tendinopathy is a degenerative condition, not primarily an inflammatory one. NSAIDs may reduce pain temporarily but do not address the underlying pathology and some evidence suggests they may impair tendon healing.
Location of pain determines treatment
Mid-portion and insertional tendinopathy require different exercise protocols. Applying the wrong one, particularly full range eccentric work for insertional presentations, can significantly worsen the condition.
"A cortisone injection will sort it"
Corticosteroid injections provide short-term pain relief but evidence shows they do not improve long-term outcomes and may increase tendon rupture risk. They are generally not recommended as a first-line treatment for tendinopathy.
It takes time, but it resolves
With the right management, the majority of Achilles tendinopathy presentations resolve fully. The timeline is typically 3-6 months for significant improvement. Consistency with loading is the most important variable.
Treatment Approach
Effective management starts with accurate diagnosis, identifies which type of tendinopathy is present, and builds a progressive loading programme around that.
Accurate identification of mid-portion vs insertional presentation, assessment of calf strength and ankle mobility, and review of training load and footwear.
A structured, individually designed tendon loading programme progressed systematically over weeks. Heavy slow resistance training is the gold standard intervention.
Targeted work to the gastrocnemius and soleus to reduce calf tension and improve tissue quality, supporting the tendon loading programme.
Can provide meaningful pain reduction and improved tissue response when applied to the calf musculature and tendon-muscle junction, supporting the rehabilitation process.
Clear guidance on what activities to continue, modify or temporarily reduce while the tendon rehabilitates, including a structured return to running protocol.
Identifying and addressing the training errors, footwear issues, hip weakness or running mechanics that created the overload in the first place.
Don't wait for it to become chronic. Early accurate assessment and the right loading programme changes outcomes significantly.