Overview
Achilles tendinopathy is a common overuse and degeneration condition that affects the Achilles tendon, the strong band connecting the calf muscles to the heel. It can develop when the tendon is repeatedly loaded beyond what it can tolerate, leading to small tissue changes, pain, and reduced tendon function. People often notice stiffness and discomfort that improves with warm-up but can return after activity. If it persists, it may feel weaker or more resistant to push-off during walking, running, or climbing stairs.
Symptoms
Pain is usually felt along the Achilles tendon, most often in the middle portion or near the insertion at the heel. Many people notice morning stiffness and first-step pain, then gradual improvement after a short warm-up, followed by worsening later in the day or after activity. The tendon may feel thickened or tender to touch, and some patients experience reduced push-off strength, a sense of tightness in the calf, or trouble with faster walking, hills, or stairs.
Causes
Achilles tendinopathy typically develops from repetitive loading and mechanical overload, such as sudden increases in walking, running, jumping, or changing footwear. Over time, the tendon can lose its ability to handle stress, and micro-injuries may accumulate even without a single dramatic injury. Poor calf flexibility, training errors, and inadequate strength or recovery can contribute to ongoing tendon irritation.
Risk Factors
Risk is higher in people who ramp up activity too quickly, have tight calf muscles, or train on hills or uneven surfaces without gradual progression. Limited ankle mobility, weak calf endurance, and changes in shoes or training surfaces can also increase tendon stress. Age-related tendon changes, certain biomechanical patterns (such as excessive pronation or reduced ankle dorsiflexion), and limited recovery between workouts can make symptoms more likely.
Prevention
Prevent flare-ups by increasing activity gradually and avoiding sudden spikes in running or jumping volume. Maintain calf strength and endurance with a consistent progressive plan, and gently improve flexibility without forcing painful stretching. Use supportive footwear, consider temporary heel lifts if advised, and ensure adequate rest and recovery so the tendon can adapt to training loads.
How the Diagnosis Is Evaluated
Clinicians typically diagnose Achilles tendinopathy based on your history of pain pattern, activity triggers, and how the tendon feels with use. A physical exam often includes checking for localized tenderness, tendon thickening, pain with resisted plantarflexion, calf tightness, and range-of-motion limits. Imaging is not always required, but ultrasound or MRI may be used if symptoms persist, if the diagnosis is unclear, or if a partial tear, inflammatory condition, or other problem is suspected.
Nonsurgical Treatment Options
Treatment usually starts with reducing irritating loads while maintaining pain-guided activity, so the tendon can begin to recover. Physical therapy is central and often includes progressive calf strengthening (commonly eccentric or heavy-slow resistance programs), mobility work, and gait or training modifications to improve mechanics and loading tolerance. Heel lifts, temporary changes in footwear, and supportive insoles can decrease strain on the tendon; bracing or a walking boot may be considered for short periods during severe flares. Pain relief may include short-term use of NSAIDs or topical anti-inflammatory options when appropriate, along with modalities such as shockwave therapy in selected cases. Injection therapies are considered when conservative care is not enough: platelet rich plasma (PRP) may be offered in some practices, and corticosteroid injections are sometimes used cautiously by specialists because they can increase rupture risk if placed incorrectly or inappropriately; hyaluronic acid (orthovisc), trigger point injections, and stem cell or adipose allograft therapies are not standard for Achilles tendinopathy and are usually limited to specialized or investigational settings.
When to Seek Medical Attention
Seek prompt medical evaluation if you experience a sudden "pop," immediate bruising, marked weakness, or you cannot bear weight, as these can suggest a partial or complete tendon tear. Get urgent care if swelling rapidly worsens, you have fever or redness suggesting infection, or you develop new numbness or progressive neurologic symptoms. If pain persists despite several weeks of well-structured conservative treatment, worsens repeatedly, or limits daily activities, arrange follow-up to confirm the diagnosis and update the treatment plan.
Frequently Asked Questions
Recovery often takes several months, and steady improvement usually depends on consistent loading and progressive strengthening rather than quick rest alone.
They can help symptoms, but stretching and icing alone typically do not resolve tendinopathy; strengthening and load management are usually required for durable improvement.
A physical therapist can tailor a progressive calf program, often using eccentric or heavy-slow resistance strengthening, plus guidance on how much soreness is safe during training.
Next Steps
Start by reducing activities that clearly worsen the pain and begin a structured, pain-guided rehabilitation plan with calf strengthening and mobility. If your symptoms are not improving after several weeks, or if you have concerning signs like sudden weakness or inability to bear weight, get an in-person evaluation to confirm the diagnosis and tailor treatment.