Quick answer
Achilles pain often appears when tendon demand exceeds current capacity. A sudden increase in running, hills, speed work, jumping or walking can contribute, but symptoms can also develop without a single obvious trigger.
Article
Load and capacity
Tendons adapt to load, but adaptation takes time. A rapid change in training volume, intensity, terrain or footwear can expose the Achilles to more demand than it is currently prepared for.
It is rarely one factor
Age, previous tendon symptoms, calf strength, metabolic health, medication exposure, activity patterns and biomechanics may all influence risk. These factors do not mean that one “fault” must be corrected in every patient.
Pain can persist after the original trigger
Once symptoms become established, sensitivity, deconditioning and altered loading patterns may perpetuate the problem. This is why simply waiting for pain to disappear without rebuilding capacity can be unsuccessful.
Key points
- Look for recent load changes, not just sporting injury.
- Risk factors modify probability; they do not prove causation in an individual.
- Rehabilitation should be matched to the patient’s functional goals.
Frequently Asked Questions
Did I cause this by exercising?
Not necessarily. Exercise is beneficial, but rapid or unfamiliar changes in load can contribute in susceptible tendons.
Should I stop all activity?
Usually not for non-acute tendinopathy. Activity is commonly modified to a tolerable level while rehabilitation proceeds.