Achilles Tendinopathy
Achilles tendinopathy — pain and stiffness in the Achilles tendon at the back of the ankle — is one of the most common overuse injuries in runners. The good news is that it usually responds well to patient, progressive loading; the catch is that tendons adapt slowly, so rushing it tends to drag things out. This is general education, not a diagnosis or treatment plan: for that, see a sports-medicine professional.
What it is
It's a load-related problem of the Achilles tendon — the thick cord connecting your calf muscles to your heel. The classic signs are pain and stiffness that are worst with the first steps in the morning (or after sitting), ease as you warm up, and often return after a run1. Most cases are *mid-portion* (a tender, sometimes thickened spot a few centimeters above the heel); some are *insertional* (right where the tendon meets the heel bone). It reflects a tendon struggling to keep up with load, not an imminent rupture.
Why runners get it
Like most running injuries, it typically follows a load spike — a jump in mileage, and especially more hills or faster running, both of which load the Achilles hard — combined with too little recovery. Reduced ankle mobility or calf weakness can contribute. The tendon gets loaded faster than it can adapt, and the result is pain and stiffness.
How it's generally managed
The best-supported cornerstone is *progressive loading* — calf- and tendon-strengthening exercise — alongside managing how much you run. Clinical guidelines specifically recommend a structured loading program (eccentric and heavy-slow calf work) for mid-portion Achilles tendinopathy1. In broad terms:
- Load it, don't just rest it: reduce the running that provokes it rather than stopping completely — controlled, pain-monitored loading is part of the rehab, not something to avoid.
- Strengthen the calf: progressive calf-loading (eccentric / heavy-slow resistance) is the most evidence-backed element — best programmed by a clinician.
- Ease off the aggravators: back off hills and fast running while it settles, then reintroduce them gradually.
- Be patient: tendons remodel over weeks to months, so consistency beats chasing a quick fix.
When to see a professional
See a sports-medicine professional if Achilles pain persists beyond a couple of weeks, isn't improving, or keeps returning when you build up — they can confirm the diagnosis and build the right loading program. Seek prompt care for a sudden, sharp "pop" or snap at the back of the ankle with a loss of push-off power — that can signal a tendon rupture and needs urgent assessment.
Safety
This article is general education, not medical advice, diagnosis, or a treatment plan. Pain at the back of the ankle has more than one cause; a sports-medicine professional should diagnose and guide treatment. A sudden sharp pop or snap with loss of push-off power warrants urgent evaluation (possible Achilles rupture).
Sources
- Martin RL, Chimenti R, Cuddeford T, Houck J, Matheson JW, McDonough CM, Paulseth S, Wukich DK, Carcia CR. Achilles Pain, Stiffness, and Muscle Power Deficits: Midportion Achilles Tendinopathy Revision 2018. Clinical Practice Guidelines. Journal of Orthopaedic & Sports Physical Therapy 48(5):A1-A38 (2018). (JOSPT clinical practice guideline on midportion Achilles tendinopathy) ↩
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