Blog 1: The Overuse Injuries Playbook
Part 1: Plantar Fasciitis: Why Your Heel Hurts and What Actually Fixes It
If you're a runner, you've probably dealt with heel pain at some point. That sharp, stabbing sensation when you first step out of bed in the morning. The ache that shows up a few kilometers into a run and lingers for the rest of the day. The tightness through the bottom of your foot that makes every step feel like you're walking on a bruise.
This is plantar fasciitis. And if you've had it, you know it's one of those injuries that doesn't just go away on its own.
What Plantar Fasciitis Actually Is
Plantar fasciitis is inflammation of the plantar fascia, the thick band of connective tissue that runs along the bottom of your foot from your heel to your toes. This tissue acts like a shock absorber and supports the arch of your foot. When it gets overloaded, it becomes inflamed, irritated, and painful.
The pain is usually worst in the morning or after long periods of sitting. That first step out of bed can feel like stepping on glass. The pain often improves once you start moving, but it comes back after long runs, long walks, or standing for extended periods.
Plantar fasciitis is an overuse injury. It doesn't show up because of one bad step or one hard workout. It shows up because of repetitive stress over time without adequate recovery.
Why Overuse Causes Plantar Fasciitis
Plantar fasciitis develops when the load placed on the plantar fascia exceeds its capacity to recover. Here's what that looks like in endurance athletes:
Sudden increases in training volume. You ramp up your weekly mileage too quickly. You add an extra run per week. You jump into a new training block without giving your body time to adapt. The plantar fascia can't handle the sudden increase in load, and it breaks down.
Poor footwear choices. Worn-out shoes that no longer provide proper arch support or cushioning. Shoes that don't fit your foot type. Switching to minimalist shoes without a gradual transition. All of these increase the stress on the plantar fascia.
Tight calves and weak feet. If your calves are tight, your ankle can't move through its full range of motion. This puts extra strain on the plantar fascia with every step. If the small muscles in your feet are weak, the plantar fascia has to work overtime to stabilize your arch.
Poor mechanics and muscle imbalances. Overpronation (your foot rolls inward excessively), flat feet, or high arches all change the way load is distributed through your foot. If your gait mechanics are off, the plantar fascia takes on more stress than it should.
Inadequate recovery. Running hard every day without rest. Not addressing tightness or fatigue. Ignoring the early warning signs of discomfort. Plantar fasciitis is an overuse injury, which means it develops when your body doesn't have enough time to recover between training sessions.
Early Warning Signs
Plantar fasciitis doesn't show up overnight. It builds gradually. The first sign is usually a mild ache in your heel or arch that shows up in the morning or after sitting for a while. It improves once you start moving, so most runners ignore it.
If you catch it at this stage and address it, you can usually resolve it quickly. If you ignore it, the pain gets worse. It starts showing up during runs. It lingers after runs. Eventually, it shows up even when you're not running. At that point, it takes longer to resolve, and you're at higher risk for compensating in other areas and developing secondary injuries.
The key is recognizing the early signs and addressing them before they turn into a bigger problem.
What Actually Fixes Plantar Fasciitis
Plantar fasciitis is fixable, but it requires addressing the root cause, not just the symptom. Here's what actually works:
Soft tissue therapy. Targeted manual therapy to the plantar fascia, calves, and surrounding muscles helps reduce tension and promote healing. This is not the same as just rolling your foot on a ball. It's about releasing the specific restrictions that are contributing to the overload.
Joint mobilizations. Gentle adjustments to the foot and ankle restore proper alignment and improve function. When your foot and ankle are moving properly, the plantar fascia doesn't have to compensate.
Strengthening the feet. The small muscles in your feet need to be strong enough to support your arch and stabilize your foot with every step. Exercises like toe curls, arch lifts, and single-leg balance work all help build the strength that takes load off the plantar fascia.
Stretching the calves. Tight calves are one of the most common drivers of plantar fasciitis. Regular calf stretches (both straight-leg and bent-knee) improve ankle mobility and reduce the strain on the plantar fascia.
Gait analysis. If your running mechanics are contributing to the problem, those patterns need to be identified and corrected. A gait analysis can help pinpoint whether you're overpronating, overstriding, or loading your foot in a way that's creating excessive stress.
Gradual return to training. If you're in the middle of a flare-up, continuing to run through the pain will only make it worse. You don't have to stop running entirely, but you do need to reduce the volume and intensity until the pain settles. Cross-training (cycling, swimming, strength work) can help you maintain fitness without aggravating the plantar fascia.
Supportive footwear. Invest in shoes that provide good arch support and cushioning. Replace worn-out shoes. If you're transitioning to a new shoe type (minimalist, zero-drop, etc.), do it gradually.
What to Watch For
If you're noticing heel pain that's worse in the morning, pain that improves with movement but comes back after long runs, or tightness through the bottom of your foot or into your ankle and calf, don't wait. Address it now.
Plantar fasciitis can become chronic if it's not treated early. The longer you ignore it, the longer it takes to resolve. And the more likely you are to develop compensation patterns that lead to other injuries.
When to Get Assessed
If you've been dealing with heel pain for more than a week or two, if the pain is getting worse instead of better, or if it's starting to affect your training, it's time to get assessed. Plantar fasciitis is not something you have to just live with. It's fixable when you address the root cause.
Dealing with heel pain or wondering if the foot pain you're noticing needs clinical attention? Book a free 15-minute phone consultation or a full assessment with me, Dr. Keirstyn, at Endurance Therapeutics. We help runners address the root cause, not just the symptom.
📍 Endurance Therapeutics | Oakville, Ontario
📞 905-288-7161