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Pain in Heel When Running: Plantar Fasciitis & Other Causes

Plantar fasciitis (irritation of the thick band of tissue along the sole of your foot) causes the large majority of heel pain in runners: a stabbing pain under your heel, worst with your first steps in the morning or after sitting for a while. But heel pain has several look-alikes worth ruling out first, from heel spurs to stress fractures and, in younger runners, a different condition altogether. Below: symptoms, self-treatment and prevention for plantar fasciitis, a guide to telling heel pain causes apart, whether night splints and taping work, how shoes and mileage fit in, whether you can keep running, heel pain in young runners, and the red flags that mean it's time to see a doctor.

Let's face it, "just rest it" isn't much of an answer when you don't actually know what you're resting. That's the gap this page fills: what real self-treatment looks like and, importantly, when heel pain stops being a self-treatment problem and needs a doctor.

Plantar Fasciitis: Symptoms, Self-Treatment and Prevention

Plantar fasciitis happens when the plantar fascia — the thick band of tissue connecting your heel bone to your toes — becomes inflamed. The result is a sharp, stabbing pain that's typically worst with your first steps in the morning, or after you've been sitting or standing still for a while.

Self-treatment is straightforward, if not always quick: rest, ice, and stretching. Reduce or pause the activities that aggravate it, and apply ice to the area for 15-20 minutes, three to four times a day, to bring inflammation down.

Stretching matters just as much. Work your plantar fascia and your Achilles tendon, and add some lower-leg strengthening on top — a stronger lower leg stabilises your ankle and heel and takes pressure off the fascia itself.

Prevention comes down to three things: build your mileage up gradually rather than jumping in too hard too soon, wear shoes with proper arch support and a cushioned sole, and keep stretching your Achilles tendon and the soles of your feet regularly so the fascia stays flexible.

I've had my own run-in with this one. It was back when I was an exchange student at Colorado State University in Fort Collins, Colorado — plenty of free time, and I filled a lot of it running laps on the student recreation centre's elevated indoor track. I didn't rate running shoes as highly back then as I do now, partly down to a student budget, and sure enough, heavily worn-out shoes landed me with plantar fasciitis. I kept going for a while longer than I should have, but once I did stop, rest, ice and stretching were all it took — and because I stopped early, it never became a chronic problem.

Heel Pain or Something Else? A Differential Guide

Plantar fasciitis is the most likely culprit, but it's not the only one — and no running site I've seen actually walks you through telling these apart. Here are the four most common look-alikes, each with the one feature that sets it apart.

Achilles tendinitis shows up at the back of the ankle or just above the heel, not underneath it, and it's typically worse after running — usually from mileage ramped up too aggressively. My own Achilles flare-ups have pretty much always come down to exactly that. The fix that's worked for me every time is backing off and taking a few more rest days early, rather than letting it build into something bigger.

Heel spurs are, clinically, a bony calcium deposit rather than inflamed tissue — but in practice they present and respond almost identically to plantar fasciitis, so much so that most runners searching for one are really describing the other. I'll be straightforward about it: the distinction matters a lot less in practice than it sounds like it should.

Stress fractures feel different again — focal, pinpoint pain on the heel bone itself, rather than a diffuse ache, and it gets worse the longer you keep weight-bearing on it. This one needs medical imaging to confirm, not self-treatment.

Bursitis is inflammation of the small cushioning sacs near your heel. It presents similarly to the above, and the good news is it responds to the same rest-and-ice protocol.

One more look-alike worth knowing about applies specifically to younger runners — see the pediatric section below if you're dealing with heel pain in a child or teenager rather than an adult.

For the full version of this comparison, see a full differential-diagnosis guide.

Do Night Splints and Taping Actually Work?

A night splint keeps your foot flexed upward while you sleep, and taping or strapping the foot is another option you'll see recommended alongside cold compresses and anti-inflammatories.

I'll be direct about the evidence rather than just listing options: some of these have more research behind them than others, and a night splint is generally the better-supported choice of the two for ongoing morning pain. Treat the rest as reasonable things to try, not guaranteed fixes.

For the full evidence review, see the evidence on night splints and taping.

Shoes and Mileage: The 400-600 Mile Rule

Make it a rule to replace your running shoes after roughly 400-600 miles. Worn-out cushioning and collapsed arch support are two of the most avoidable contributors to heel pain, and this one's entirely within your control.

While you're dealing with a flare-up, stick to shoes with real arch support and steer clear of flat, unsupportive footwear — sandals and flip-flops included — until things settle.

If your arch type or pronation pattern is part of the picture, it's worth checking directly rather than guessing — see how to assess your own arch type and pronation.

Can I Keep Running With Plantar Fasciitis?

Not a flat yes or no — it comes down to how the pain behaves. Mild pain that eases within 24 hours and stays low on a pain scale can often be run through cautiously. Pain that doesn't ease with warmup, or that gets worse as the run goes on, means stopping.

For the full decision framework, see a pain-scale guide for when to keep running. And for what recovery actually looks like week to week, rather than a vague "a few weeks," see a real week-by-week return timeline.

Pediatric Heel Pain: Sever's Disease in Young Runners

If the runner with heel pain is under 20 — most commonly around age 11 — the cause is often not plantar fasciitis at all, but Sever's disease (calcaneal apophysitis). It's a different condition for a different age group, not a milder version of the adult problem: a young runner's heel bone still has an unfused growth plate, and that growth plate, not the plantar fascia, is what's under strain.

If a child or teenager's heel pain doesn't settle with rest within a couple of weeks, that's the point to get it checked by a doctor or physio rather than keep managing it yourself — see the red flags below.

When to See a Doctor (Red Flags)

Self-treatment handles most heel pain, but a few signs mean it's time to see a professional instead:

• Excessive bruising or swelling
• Pain severe enough to prevent weight-bearing
• Signs of infection or a fever
• Pain that persists or worsens despite rest
• Focal, pinpoint pain directly on the heel bone — a possible stress fracture
• Any child or teen heel pain that doesn't respond to rest within a couple of weeks — possible Sever's disease needing evaluation

That's the point where self-treatment hands off to a clinician, not a soft "if you're worried" caveat. Recognising that boundary is as much a part of coaching as the training advice either side of it.

For foot and ankle strengthening work that helps prevent heel pain in the first place, see foot and ankle strengthening exercises, and for the broader picture across every running injury, see red-flag symptoms across running injuries.
Whatever's behind your heel pain, the principle is the same: work out the actual cause, treat it properly, and don't rush back before it's ready. Most cases settle with a sensible few weeks of the right approach — but if yours fits one of the red flags above, get it looked at properly rather than guessing indefinitely.

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