Why Does Plantar Fasciitis Get Worse When You Run More?
You increase your mileage because you're training for a race.
Everything feels fine for the first few weeks.
Then your heel starts hurting.
At first, it's only noticeable in the morning so you simply shrug it off
Then it starts hurting during your runs.
Eventually, you're changing how you run because you're trying to protect the painful foot.
You don’t stop running because you are following a specific program.
This progression is common with plantar fasciitis.
The issue isn't necessarily that running is damaging your feet.
More commonly, the amount of load being placed on the plantar fascia has exceeded your current ability to tolerate that load.
What Is Plantar Fasciitis?
The plantar fascia is a strong band of connective tissue that runs along the bottom of the foot.
It contributes to:
Arch support
Force transfer
Foot stiffness
Propulsion during walking and running
During running, the plantar fascia experiences repetitive loading.
When training volume increases rapidly, that repeated exposure can become irritating.
Why Mileage Matters
Imagine you normally run 10 miles per week.
You decide to train for a half marathon and increase to 20 miles.
That's not simply twice as much running.
Your feet are now absorbing thousands of additional loading cycles every week.
If your calf strength, foot strength, recovery, and tissue capacity haven't progressed alongside your mileage, symptoms may develop.
It's Not Just About Your Feet
A common mistake in treating plantar fasciitis is focusing exclusively on the painful area.
The foot is part of a kinetic chain.
We should also consider:
Ankle mobility
Calf capacity
Quadriceps strength
Hip strength
Pelvic control
Single-leg stability
Running mechanics
Training volume
This is why a detailed physical therapy evaluation can be valuable.
Objective Testing Can Identify Capacity Deficits
At Carolina Movement Doc, we use objective performance testing when appropriate.
DynaMo can be used to assess strength in areas such as:
Hip abduction
Hip extension
Knee extension
Calf musculature
This helps determine whether meaningful strength deficits or asymmetries exist.
VALD ForceDecks can provide additional information about force production and lower-extremity performance.
For runners, objective data can help us move beyond:
"Your leg looks weak."
Instead, we can quantify performance and monitor how it changes throughout rehabilitation.
What Does Plantar Fasciitis Physical Therapy Look Like?
Successful rehabilitation usually involves gradually improving the capacity of the foot and lower extremity.
Treatment may include:
Calf Strengthening
Both straight-knee and bent-knee calf exercises can be important.
Foot Strength
Exercises can target intrinsic foot control and the ability to maintain the arch during loading.
Hip and Knee Strength
The proximal muscles contribute to single-leg control during running.
Progressive Loading
The foot needs to progressively experience the types of forces it will encounter during running.
Running Progression
Rather than immediately returning to previous mileage, running exposure can be strategically progressed.
Should You Stop Running?
Not necessarily.
The answer depends on symptom severity, irritability and how your symptoms respond to loading.
Some runners can continue modified running while beginning rehabilitation.
Others may temporarily need to reduce impact while capacity improves.
The goal is to find the appropriate training dose.
When Should You Seek Help?
Consider a physical therapy evaluation if:
Heel pain has lasted several weeks
Pain continues to worsen as mileage increases
Morning pain is becoming more severe
You're changing your running mechanics to avoid pain
You repeatedly develop plantar fasciitis
You have reduced calf strength
You cannot increase mileage without symptoms returning
Plantar Fasciitis Treatment in Gastonia
At Carolina Movement Doc, plantar fasciitis treatment isn't simply about stretching the bottom of your foot.
We combine:
Movement analysis + objective strength testing + progressive loading + running-specific rehabilitation.
The goal is to help you return to running while improving the physical capacity that allows you to keep running.
If plantar fasciitis is limiting your training, Carolina Movement Doc can help determine what's contributing to the problem and develop a plan to get you moving again.
