Heel Pain Differential Diagnosis Guide
If you’re a runner with pain around the heel, Achilles, or back of the ankle, the most useful first question isn’t “What exercise do I need?” — it’s “Where exactly does it hurt?” That one-finger location (and what movements flare it up) can narrow the shortlist quickly, because a sore Achilles in the mid-portion behaves very differently from an insertional problem, a bursa irritation, a nerve issue, or even bone stress. The table below is a runner-friendly “pain map” to help you match pain location + typical triggers to the most likely culprits, so you can stop guessing and start making sensible training decisions. It’s not a substitute for an assessment — problems can overlap — but it’s a strong starting point for understanding what you’re dealing with and what to do next. It’s designed to help runners narrow down what’s most likely based on exact pain spot plus what winds it up.
A key reminder: location guides the shortlist, but it’s not a perfect diagnosis on its own (it’s common to have overlap, e.g., Haglund’s + bursa + insertional Achilles irritation).
Heel & Achilles pain map for runners (by where it hurts)
| Where it hurts (one-finger spot) | Most likely issue | What makes it stand out | What to do this week (simple first step) |
|---|---|---|---|
| Back of heel, right where the tendon attaches to the bone (0–2 cm) | Insertional Achilles tendinopathy | Often hates deep ankle bend (dorsiflexion) because the tendon gets compressed against the heel bone. Hills + calf raises off a step often aggravate. | Keep calf work on flat (don’t drop heel below level). Reduce hills. A small heel lift can calm symptoms. |
| Achilles tendon 2–6 cm above the heel (a couple of finger widths up) | Mid-portion Achilles tendinopathy | Classic morning stiffness, “warms up” as you move, then can ache after running. Often linked to speed/hills/load spikes. | Keep running easier/shorter. Start isometric calf holds if sore, then progress calf strengthening. |
| Around the tendon (more “all round” than one dot), sometimes swollen | Paratenonitis (paratendon irritation) | Often more sudden after a load jump, can feel creaky with ankle movement, and looks more like “around the tendon” swelling. | Remove the recent load spike (easy running or cross-train). Avoid speed sessions until swelling settles. Reload gradually. |
| Inner (medial) side of the Achilles, very focal | Plantaris tendinopathy / plantaris involvement | Focal pain just to the inside of the Achilles. Can behave like “Achilles that won’t settle” despite doing calf rehab. | Manage load like Achilles. If stubborn or sharp, get assessed (it can mimic Achilles pain closely). |
| Deep at the back of the heel, between tendon and bone | Retrocalcaneal bursitis | Feels deep/pinchy, often worse with shoes pressing the heel and with uphill/deep ankle bend. | Reduce shoe pressure (softer heel counter). Avoid deep dorsiflexion. Consider a small heel lift short-term. |
| Bony bump on the upper back of the heel with shoe rubbing | Haglund’s (“pump bump”) | Shoe conflict is the story: rubbing/pressure + swelling. Often overlaps with insertional tendon/bursa irritation. | Change footwear/heel counter fit. Reduce hills. Avoid deep calf stretching into pain. |
| Deep pinchy pain at the very back of the ankle joint (not in the tendon) | Posterior impingement / os trigonum pain | Worse when pointing toes down hard (sprinting, jumping, strong push-off). Feels more “joint pinch” than tendon pull. | Avoid end-range toe pointing + aggressive speed work. Keep runs flatter/easier; reassess if persistent. |
| Pain “below the ankle”, worse on uneven ground (medial or lateral) | Subtalar joint irritation | Often hates trails/camber/uneven ground. Feels deep and “hindfoot-jointy.” | Pick flatter routes. Reduce trail volume. Build ankle/foot control gradually. |
| Inner ankle behind the bony knob (medial malleolus) and/or arch | Tibialis posterior tendinopathy | Feels like the arch gets tired; often worse with long runs, hills, camber. Tender behind inner ankle. | Reduce hills/camber. Start controlled calf + foot strengthening. Short-term support/taping can help if very irritable. |
| Outer back ankle/heel with burning/tingling into outer foot | Sural nerve irritation | The giveaway is nerve-type symptoms: burning, pins/needles, numbness. Often from compression (tight shoes) or swelling after sprain. | Remove compression (footwear). Avoid aggressive stretching. Get assessed if symptoms persist/spread. |
| Deep calf ache (feels like tightness near Achilles but more in muscle) | Soleus overload/strain | Often worse later in runs and with hills; more sensitive with bent-knee calf work than straight-knee. Tendon itself may not be very tender. | Reduce hills. Start isometric calf holds and progressive strengthening/endurance work. |
| Kids/teens (usually 8–14): back/underside heel pain during growth spurts | Sever’s (heel growth plate irritation) | Age and growth spurt context matters. Activity-related pain after running/jumping; settles with rest. | Reduce jumping volume. Cushioned shoes/heel lift. Gradual return as symptoms calm. |
| Deep heel pain that ramps up with impact, may progress to pain at rest | Calcaneal stress fracture (bone stress) | Impact is the trigger: hopping hurts a lot; trend is worsening. This is the one you don’t “push through.” | Stop impact running and get assessed. Early action matters with bone stress. |
Quick safety check (runner-friendly)
Get assessed sooner if:
- You cannot hop without sharp pain
- Pain is worsening week to week (especially with night/rest pain)
- You felt a sudden pop/tear or have major bruising/swelling
- Numbness/tingling is spreading or persistent
Thank you for Reading
James @physiorun
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