Achilles Pain While Running: Causes, Diagnosis & Treatment

Achilles pain is the injury that sidelines more runners than almost any other. The frustrating reality: Achilles tendinopathy develops slowly and is often ignored in its early stages — then becomes a stubborn problem that takes months to resolve if not properly managed. In our Howell and Bloomfield Hills clinics, we treat runners with Achilles problems regularly, and early intervention always produces faster results than waiting.

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Types of Achilles Pain in Runners

Not all Achilles pain is the same. Location and onset characteristics determine the diagnosis and guide treatment:

Mid-Portion Achilles Tendinopathy

Pain and thickening in the middle of the tendon, approximately 2–6 cm above the heel bone insertion. The most common type in runners. Classified as tendinopathy (not tendinitis) because chronic cases show degenerative change (tendinosis) rather than acute inflammation. Responds well to eccentric loading exercise.

Insertional Achilles Tendinopathy

Pain at the point where the tendon inserts into the posterior (back) of the heel bone. Often accompanied by Haglund’s deformity — a bony prominence on the back of the heel that impinges on the tendon. Less responsive to eccentric loading than mid-tendon tendinopathy; heel drop exercises that stretch the tendon can actually worsen insertional pain.

Achilles Tendon Tear or Rupture

Acute, sudden pain with a “pop” sensation during activity — not the gradual onset of tendinopathy. Partial tears present with acute pain but maintained Achilles function; complete rupture produces inability to plantar-flex (push off) against resistance. The Thompson test (squeeze the calf while lying prone — the foot should plantar-flex if the tendon is intact) distinguishes partial from complete rupture. Complete rupture requires urgent orthopedic evaluation.

Paratendinitis

Inflammation of the paratenon — the fibrous sheath surrounding the Achilles. Produces diffuse swelling and “creaking” (crepitus) with movement. Acute and more inflammatory than tendinopathy proper. Responds to rest and NSAIDs faster than tendinopathy.

Symptoms of Achilles Pain While Running

• Morning stiffness — the Achilles feels stiff for the first few steps; improves after 5–10 minutes of walking; a hallmark of tendinopathy
• Start-up pain — pain at the beginning of a run that often improves (the “warm-up phenomenon”) and then worsens again after stopping
• Post-run soreness — pain and stiffness in the 24–48 hours after running
• Localized tenderness — a palpable tender spot in the mid-tendon or at the insertion
• Thickening of the tendon — the tendon may feel nodular or visibly thickened at the painful area
• Reduced calf strength — inability to perform 20+ single-leg calf raises without pain

What Causes Achilles Pain in Runners?

• Training load errors — the most common cause; sudden increase in mileage, speed, or hill work; the 10% rule (don’t increase weekly mileage by more than 10%) exists precisely to prevent this
• Tight gastrocnemius-soleus complex — restricted ankle dorsiflexion places higher eccentric load on the Achilles with each running step
• Overpronation — excessive inward heel rolling rotates the Achilles medially, creating abnormal tensile and torsional stress
• Heel drop too low in running shoes — minimalist or zero-drop shoes place the Achilles in a maximally lengthened position with every stride; sudden transition causes tendinopathy in runners whose tendons haven’t adapted
• Cavus foot (high arches) — rigid supination increases Achilles tension during gait
• Weak hip abductors — hip weakness contributes to compensatory overpronation that stresses the Achilles
• Surface change — transition from soft to hard running surfaces increases load
• Cold weather — tendon compliance is lower in cold; injury risk increases when warming up is skipped

Diagnosing Achilles Pain in Runners

• Clinical examination — palpation along the tendon identifies the painful location; arc sign (the tender spot moves when the foot is moved) confirms tendon pathology rather than paratenon
• Royal London Hospital Test — resisted dorsiflexion at 10° reduces mid-tendon pain (positive test suggests tendinopathy rather than paratenon)
• Ultrasound — visualizes tendon structure, identifies tears, neovascularization, and calcifications; excellent dynamic imaging
• MRI — definitive imaging for partial tears, insertional pathology, and Haglund’s retrocalcaneal bursitis
• Single-leg calf raise endurance test — measures functional capacity; used to track treatment progress

Treatment for Achilles Pain While Running

Phase 1: Load Management (Weeks 1–4)

• Reduce or eliminate running; replace with swimming, cycling, or aqua-jogging to maintain fitness
• Add a 1–1.5cm heel lift to both shoes immediately — reduces Achilles tension; provides rapid pain relief
• Ice 15–20 minutes after any activity
• Avoid calf stretching in insertional tendinopathy — this loads the insertion; continue stretching for mid-tendon
• NSAIDs for the first 1–2 weeks only

Phase 2: Eccentric Loading Program (Weeks 2–12)

The Alfredson eccentric heel drop protocol has the strongest evidence base for mid-portion Achilles tendinopathy:

• Stand on the edge of a step on the affected foot with the heel hanging off
• Rise onto tiptoe using both feet
• Lower slowly (3 seconds) using the affected foot only
• 3 sets of 15 repetitions, twice daily, 7 days per week
• Continue even when it hurts — this is the key departure from most rehab; pain during eccentric loading is acceptable (not sharp pain)
• Progress to single-leg rise when tolerated
• Perform for a minimum of 12 weeks

For insertional tendinopathy: modify the protocol — perform exercises on a flat surface, not a step edge (avoid end-range dorsiflexion that compresses the tendon at its insertion).

When Shoes Aren’t Enough — Dr. Tom’s Top 9 Orthotics

About 30% of patients I see for foot pain need MORE than a great shoe — they need a structured insole. Below: my complete 2026 orthotic ranking with pros, cons, and the specific patient I’d give each one to.

Phase 3: Return to Running (Weeks 8–16)

• Begin with a walk-run protocol when pain during the eccentric program is 2/10 or less
• Increase running volume by 10% per week maximum
• Avoid speed work and hill running until fully asymptomatic
• Custom orthotics to control pronation and support the foot
• Continue eccentric loading 3x per week as maintenance

Frequently Asked Questions About Achilles Pain Running

Should I stop running if I have Achilles pain?

It depends on severity. For mild tendinopathy (pain 1–3/10, resolves during the run, minimal post-run soreness): reduce volume and intensity by 50% while starting eccentric loading. For moderate pain (4–6/10): stop running for 2–4 weeks, maintain fitness with cycling or swimming, begin eccentric loading. For severe pain or if you cannot walk without limping: stop running entirely and see a podiatrist promptly.

How long does Achilles tendinopathy take to heal in runners?

Mid-portion Achilles tendinopathy with proper management (12-week eccentric protocol) produces significant improvement in 12 weeks and return to full running by 16–24 weeks. Insertional tendinopathy typically takes longer — 3–6 months. Chronic cases (present for more than 6 months) take longer still. The sooner you start proper treatment, the faster recovery proceeds.

Does stretching help Achilles tendinopathy?

For mid-portion Achilles tendinopathy: yes, gentle Achilles stretching helps restore flexibility and reduces tightness. For insertional Achilles tendinopathy: stretching into maximum dorsiflexion compresses the tendon at its insertion and can worsen symptoms. This is why knowing which type you have matters before starting a stretching protocol.

What is the best running shoe for Achilles tendinopathy?

A shoe with 8–12mm heel-to-toe drop reduces Achilles tension by keeping the heel slightly elevated. Avoid zero-drop or minimalist shoes during treatment. HOKA, Brooks, and ASICS offer supportive running shoes with appropriate heel drops. Adding a 1cm heel lift to both running shoes immediately reduces Achilles tension and often provides significant pain relief within days.

Can I run through Achilles tendinopathy?

Mild, early tendinopathy can be managed with reduced training loads while continuing running — this is called “training through.” However, running through moderate to severe tendinopathy without proper eccentric loading and load management converts a reversible overuse injury into a chronic, degenerative condition. The worst approach: taking a week off, returning to full training, breaking down again. Proper structured rehabilitation with temporary activity modification produces faster full recovery.

Sources

• Alfredson H, et al. Heavy-load eccentric calf muscle training for the treatment of chronic Achilles tendinosis. Am J Sports Med. 1998;26(3):360–6.
• Beyer R, et al. Heavy slow resistance versus eccentric training as treatment for Achilles tendinopathy. Am J Sports Med. 2015;43(7):1704–11.
• Maffulli N, et al. Mid-portion Achilles tendinopathy. Disabil Rehabil. 2008;30(20–22):1670–81.
• Silbernagel KG, et al. Continued sports activity, using a pain-monitoring model, during rehabilitation in patients with Achilles tendinopathy. Am J Sports Med. 2007;35(6):897–906.