Why Does My Knee Hurt When I Run but Not When I Walk?
One of the most common things we hear from runners is:
“My knee feels completely fine during the day. It only hurts when I run.”
You can walk around work, take the stairs, go to the gym, and handle everyday life without thinking twice about your knee.
Then you head out for a run and a few miles in, there it is again.
So what gives?
The simple answer is that running asks a lot more from your body than walking does.
And sometimes pain during running is the first sign that your body's current capacity isn't matching the demands you're placing on it.
Running and Walking Are Two Very Different Demands
Walking without pain is a good thing, but it doesn't necessarily mean your knee is prepared for running.
When you run, you're repeatedly absorbing and producing much higher forces while spending less time on each leg.
And you don't do it once.
You do it thousands of times over the course of a run.
Your muscles, tendons, joints, and nervous system all have to be able to tolerate that repeated demand.
That's why something can feel perfectly fine walking around the grocery store but start bothering you three miles into a run.
It Might Not Just Be Your Knee
This is where runners often make a mistake.
Your knee hurts, so you assume your knee is the problem.
But your knee sits between your hip and ankle.
If your ankle isn't moving well, your hip isn't producing enough force, or you're lacking strength and control somewhere along the chain, your knee may have to pick up the slack.
That's why simply stretching, foam rolling, or treating the painful area doesn't always solve the problem.
We want to understand why that knee is being overloaded in the first place.
Your Training Load Matters
This is especially important when you're training for a race.
Maybe three miles never bothered you.
Then your training plan progresses to five.
Then seven.
Then nine.
Your cardiovascular fitness might be ready to keep going, but that doesn't automatically mean every tissue in your body has adapted at the same rate.
Changes in mileage, pace, hills, frequency, strength training, sleep, and recovery can all affect how much stress your body is being asked to tolerate.
Sometimes the question isn't:
“What's wrong with my knee?”
It's:
“What changed that made this more than my knee could currently handle?”
Should You Stop Running?
Not necessarily.
Pain doesn't automatically mean you need to shut down your training completely.
Depending on what's going on, you may be able to modify your mileage, pace, frequency, terrain, or training while continuing to build the strength and capacity you're missing.
That's why we don't love the blanket advice to “just stop running.”
If your goal is to run, eventually your rehab needs to prepare you to... run.
Don't Wait Until You Can't Run
One of the biggest mistakes runners make is waiting until their knee pain becomes bad enough that they're forced to stop.
If your knee consistently starts hurting at mile four, that's information.
If it's happening every long run, that's information.
If you're changing your stride or training schedule to avoid it, that's information.
You don't have to wait until something completely sidelines you before addressing it.
The goal isn't just to make your knee feel good walking around.
It's to build a body that can tolerate the miles you're asking it to run.
Training for a race and dealing with knee pain?
At Apex Performance Institute, we work with runners to figure out what's contributing to their pain, address the limitations we find, and build their body back up to the demands of running.
