A sore Achilles tendon can create a confusing pattern. It may feel stiff when you first get up, loosen after a few minutes of walking and then become painful after running, playing sport or spending a long day on your feet. The natural reaction is often to stop everything until the pain disappears. A short reduction in irritating activity can be useful, but prolonged rest alone does not prepare a tendon to tolerate normal activity again.

What is Achilles tendinopathy?

The Achilles tendon connects the calf muscles to the heel bone and transmits substantial force during walking, stair climbing, running and jumping. Achilles tendinopathy describes a painful tendon problem associated with reduced tolerance to load. One common form, midportion Achilles tendinopathy, causes symptoms several centimetres above the heel. The 2024 clinical practice guideline from the Academy of Orthopaedic Physical Therapy reviews diagnosis, loading, examination and rehabilitation for this condition.

Why can it start?

Sometimes there is an obvious trigger: a sudden increase in running distance, hill sessions, football after a long break or repeated sprint work. Other times, there is no dramatic injury. The tendon has simply been exposed to more load than it is currently prepared to handle. Training frequency, intensity, recovery, calf capacity and the demands of work or daily life all matter. This load-and-capacity idea is similar to what Revive discusses in its article on recurrent ankle sprains and incomplete rehabilitation, where pain settling is not the same as full physical readiness.

Why complete rest can be frustrating

Rest often reduces symptoms because it removes the activity that provokes them. But it also removes the stimulus the calf and tendon need to remain strong. If someone rests until pain disappears and immediately returns to the same sporting load, the tendon may again be asked to handle more than it can tolerate. Modern tendon rehabilitation therefore commonly uses progressive loading rather than indefinite avoidance. The goal is not to exercise aggressively through severe pain, but to find a manageable starting point, monitor the response and gradually increase capacity.

What might physiotherapy involve?

A physiotherapist may examine the exact location and behaviour of the pain, calf strength and endurance, ankle movement, recent training history and the patient's walking, running or jumping demands. Rehabilitation frequently includes heel-raise or calf-strengthening exercises that are progressively made harder. Later stages may include faster loading, hopping, running or sport-specific drills where appropriate. Revive's sports injury rehabilitation article provides useful context on why restoring range, strength and sport-specific function is more important than relying on passive treatment alone.

Does pain during exercise always mean damage?

Not automatically. Pain and tissue damage are not identical measures. In tendon rehabilitation, clinicians often consider how much discomfort occurs during activity, whether it settles afterwards and how the tendon feels the following morning. A mild response that returns to baseline can be treated differently from pain that becomes progressively worse, changes walking or remains markedly aggravated the next day. This is why a programme should be tailored rather than copied from someone else's routine.

What about massage, stretching or shockwave?

These may sometimes be used as adjuncts depending on the individual, but they should not distract from the central rehabilitation problem: restoring the tendon and calf's ability to accept load. Revive's shockwave therapy guide also notes the importance of combining modalities with a broader strengthening programme. For a patient seeking a structured assessment and progression plan, the clinic's physiotherapy services page outlines the available rehabilitation support.

When should you seek assessment?

Consider professional assessment if pain is persistent, progressively worsening, affecting walking or preventing a return to sport. Seek urgent medical attention after a sudden injury if you feel or hear a pop around the Achilles, develop significant swelling or bruising, or suddenly cannot push off the foot normally. Those features can indicate an acute rupture rather than tendinopathy.

The practical takeaway

With Achilles tendinopathy, the question is usually not 'rest or exercise?' It is how much load the tendon can handle now and how that load can be increased safely over time. Good rehabilitation sits between two extremes: repeatedly overloading an irritated tendon and avoiding loading it indefinitely.

Related Revive resources

• Rehabilitation After Ankle Sprains

• Common Sports Injuries in Kuwait

• Physiotherapy Services

Sources

• Chimenti RL et al. - Midportion Achilles Tendinopathy Revision 2024, JOSPT

• American Physical Therapy Association - Achilles Tendinopathy CPG

Medical disclaimer: This article is for general informational and educational purposes only. It does not provide a diagnosis or personalised treatment plan and does not replace advice, examination or treatment from a qualified doctor, physiotherapist or other healthcare professional. Seek appropriate medical attention for severe, rapidly worsening, traumatic, neurological or otherwise concerning symptoms.