What Achilles tendinopathy actually feels like

For most people, Achilles tendinopathy announces itself gradually rather than dramatically. The hallmark is a nagging ache or stiffness at the back of the heel — particularly sharp during those first few steps out of bed in the morning, or after sitting for a long stretch. A short walk often eases it, which can be reassuring, but the discomfort tends to return once activity picks up in earnest, especially with running, climbing stairs, or pushing off the toes.

The pain sits in one of two distinct locations. Mid-tendon tendinopathy is felt roughly 2–6 cm above where the tendon meets the heel bone — this is the more common presentation. Insertional tendinopathy, by contrast, is felt right at the heel bone itself, and the two subtypes respond to slightly different management approaches, which is one reason a proper assessment matters.

Mild swelling or a thickening along the tendon is common; the skin over it is rarely hot or visibly inflamed. Many people notice the tendon feels tender to the touch, particularly when pinching it between thumb and finger.

The unpredictability can be as frustrating as the pain itself. A run that goes well on Saturday gives way to stiffness by Sunday morning, and a 'good week' is no guarantee the discomfort has gone for good.

One distinction is worth flagging early: a sudden, sharp pain accompanied by a 'pop' or snap — especially one that stops you mid-stride — is an entirely different presentation from the gradual-onset pattern described above, and it warrants urgent attention. That scenario is addressed separately later in this article.

Why rest makes it worse — and what to do instead

Reaching for rest is an understandable instinct — but with Achilles tendinopathy, it is the wrong one. NHS Scotland is explicit on this point: the tendon does not heal with rest. Stopping activity entirely allows the tendon to decondition further, making it less tolerant of load when you eventually return to movement. The therapeutic goal is the opposite: graduated, controlled loading.

The exercise that anchors first-line management is the eccentric calf raise. Standing on the edge of a step, rise up on both feet, then lower slowly on the affected leg alone over roughly three seconds. Fifteen repetitions, three sets, performed three to four times a day. The slow lowering phase is what matters — it places the tendon under the controlled tension it needs to remodel. Some mild discomfort during the exercise is acceptable and expected; sharp or worsening pain is a signal to ease back.

This is a months-long commitment. Evidence from a study of 78 patients followed for over six years found eccentric exercise alone achieved meaningful improvement in 71.8% of cases — but the same research makes clear that the full benefit typically takes three to six months to develop. Early improvement is common and encouraging; it is not a sign that the programme can be stopped.

Alongside exercise, heel lifts inside shoes reduce strain on the tendon, and low-heeled footwear with soft soles helps throughout the day. Ice or heat applied for up to 20 minutes — always with a cloth barrier against the skin — can ease symptoms. Paracetamol or a topical NSAID such as ibuprofen gel are appropriate for pain relief.

One treatment to avoid raising with a GP as a quick fix: corticosteroid (steroid) injection. NICE CKS guidance and NHS referral frameworks explicitly advise against injecting around the Achilles tendon — any short-term benefit is outweighed by the risk of tendon weakening and, in the worst cases, rupture.

The 12-week mark: when to see a GP or physiotherapist

Twelve weeks without meaningful improvement is the point at which self-management alone is unlikely to be enough. NICE CKS guidance is clear: persistent symptoms at this stage warrant referral to a GP, a specialist physiotherapist, or both.

"Meaningful improvement" does not mean complete resolution — the tendon remodels slowly, and full benefit from an eccentric programme takes months. It means a noticeable reduction in pain at rest, less morning stiffness, and the ability to work through the exercise programme with gradually less provocation. If those markers are absent at 12 weeks, professional input changes the trajectory in ways continued self-management rarely does.

A GP referral at this stage is primarily a gateway rather than a treatment. It serves to exclude systemic or inflammatory causes — such as inflammatory arthropathy or referred spinal pain — and to facilitate onward specialist physiotherapy or targeted imaging where the clinical picture warrants it. The surgical pathway is a separate, much later consideration that only becomes relevant if months of structured conservative management have failed.

Specialist physiotherapy extends well beyond the home-exercise programme: it may include supervised eccentric loading, assessment for extracorporeal shockwave therapy (ESWT), and gait and load analysis to identify contributing biomechanical factors.

If the diagnosis itself is in doubt — symptoms that do not fit the typical gradual-onset pattern, bilateral involvement, or features that could point to a different condition — the threshold shortens considerably. The Royal College of Podiatry advises seeking professional advice after just three weeks when the cause of heel pain is unclear, reflecting how many different conditions can produce similar symptoms.

Red flags that need same-day assessment

Everything described in the sections above — the gradual morning stiffness, the ache that eases with movement — is consistent with tendinopathy. A different set of symptoms, arriving suddenly during exercise, signals something more serious.

Signs that suggest an Achilles rupture

These are not features of tendinopathy. If any appear, the situation is urgent:

• A sudden sharp 'pop' or 'snap' at the back of the heel — typically during a sprint, jump, or forceful push-off
• A visible or palpable dip or gap in the tendon, a few centimetres above where it meets the heel bone
• Inability to stand on tiptoe or push the foot downward against any resistance
• Rapid swelling and bruising spreading across the lower calf and heel

A straightforward check that clinicians use: lying face down, squeezing the calf muscle should cause the foot to move. If the foot stays still, that strongly suggests a complete rupture — this is the basis of the Thompson's (or Simmonds') calf-squeeze test.

If any of these signs are present, do not wait for a routine GP appointment. Same-day orthopaedic assessment — via A&E or an urgent referral pathway, depending on local arrangements — is the appropriate step. NICE CKS guidance is explicit on this point.

A delayed presentation also matters. A rupture that has gone undiagnosed for six weeks or more still warrants urgent specialist review, because the options for surgical reconstruction narrow as time passes.

Other causes of heel pain that can mimic Achilles tendinopathy

Plantar fasciitis — pain under the arch and forward edge of the heel rather than at the back — is the most common condition mistaken for Achilles tendinopathy, and the two can co-exist. Retrocalcaneal bursitis, Haglund's deformity (a bony prominence at the back of the heel), tarsal tunnel syndrome, referred pain from the lumbar spine, and inflammatory arthropathies such as psoriatic or reactive arthritis can all produce heel and lower-leg symptoms that are difficult to distinguish without clinical assessment.

Certain features warrant professional advice sooner than the 12-week threshold:

• Bilateral Achilles or heel pain without a clear mechanical explanation
• Systemic symptoms: fatigue, swelling in other joints, skin changes, or a recent infection
• Pain that does not ease with movement, or that worsens despite graduated loading in a way typical tendinopathy does not

The distinction between insertional and non-insertional subtypes — described in the first section — matters in this context too: the standard eccentric-loading protocol can initially aggravate insertional cases, so an atypical or worsening response to self-management is itself a reason to seek professional review rather than persisting with the same approach.

When referral does go forward, a practical point: UK orthopaedic departments typically require a weight-bearing X-ray of the foot and ankle before assessing a patient, and referrals submitted without one are often returned. Routine diagnostic ultrasound does not normally change primary-care management and is not a prerequisite for referral.

The overall principle is straightforward: if the picture is atypical, bilateral, or accompanied by systemic features, seek assessment from a GP, physiotherapist, or podiatrist — without waiting for 12 weeks.

What specialist assessment and the longer-term pathway involve

Arriving at a specialist appointment with a diagnosis already in mind is understandable — but the first priority is re-examining that diagnosis. A musculoskeletal clinician assesses through clinical history, physical examination (load testing, palpation, functional movement), and imaging where indicated. A scan result alone does not drive management; the pattern of pain, the response to loading, and the examination findings together shape the plan.

Even at specialist level, supervised physiotherapy remains the primary treatment. A structured eccentric loading programme — typically requiring three to six months to show clear benefit — achieved a 71.8% success rate (rated 'fully healed' or 'much improved') in a retrospective study of 78 patients followed over a mean of 6.3 years. For cases that remain resistant after sustained physiotherapy, extracorporeal shockwave therapy (ESWT) is a recognised secondary-care option. It may accelerate early recovery, though published evidence suggests it does not materially alter long-term outcomes compared with exercise alone.

Surgical debridement or tendon repair enters consideration only after at least six months of intensive supervised conservative management has failed. It is a last resort, not a routine step.

A minority of people with chronic tendinopathy develop central or peripheral sensitisation — a process in which the nervous system amplifies pain signals independently of tendon tissue state. This may explain why standard loading programmes sometimes fail to reduce pain despite apparent structural improvement. For this subgroup, specialist input may extend beyond intensified exercise to include pain-mechanism education, graded sensory retraining, or review by a pain management team — a meaningfully different pathway from the standard exercise-and-wait approach.