Knee Pain When Running: Common Causes and What to Do Next
Knee pain is one of the most common problems experienced by runners. It may appear gradually as your mileage increases, develop after introducing hills or speed sessions, or begin suddenly during a run.
Although knee pain is often described as “runner’s knee”, this is not a specific diagnosis. Different structures can produce similar symptoms, and effective treatment depends on understanding what is contributing to the problem.
Where Does Your Knee Hurt?
The location of your pain can provide useful information, although it should not be used to diagnose the problem by itself.
Pain at the Front of the Knee
Pain around or behind the kneecap is commonly associated with patellofemoral pain. It may be aggravated by running, squatting, stairs or sitting with the knee bent for a prolonged period.
This does not necessarily mean that the knee is damaged. Symptoms can develop when the demands placed on the knee exceed its current ability to tolerate them.
Pain Below the Kneecap
Pain localised to the patellar tendon, between the kneecap and shin, may indicate patellar tendinopathy. This is often associated with running, jumping and rapid increases in training intensity.
Tendons usually respond best to carefully managed loading and progressive strengthening rather than complete long-term rest.
Pain on the Outside of the Knee
Outer knee pain during running is sometimes associated with irritation around the iliotibial band. It may begin at a predictable distance and become progressively more uncomfortable as the run continues.
Training volume, hills, running speed and lower-limb strength may all need to be considered.
Pain on the Inside of the Knee
Inner knee pain can originate from several structures, including muscles, tendons, ligaments or the joint itself. A clear diagnosis cannot be made from location alone, particularly if the symptoms started following a twist or sudden change of direction.
Why Has the Pain Started?
Running injuries rarely have one isolated cause. Common contributing factors include:
A rapid increase in running distance or frequency
Introducing hills or speed work too quickly
Reduced recovery between sessions
Changes in footwear or running surface
Previous injury
Reduced strength or capacity around the hip, knee or calf
Returning to running before rehabilitation is complete
The important question is not simply which structure hurts, but why it has become sensitive now.
Should You Stop Running?
This depends on the severity and behaviour of your symptoms.
If running causes increasing pain, changes your movement or leaves the knee significantly worse afterwards, reducing or temporarily pausing running is sensible. Lower-impact activities such as cycling or swimming may help maintain fitness while the knee settles.
Complete rest is not always the long-term answer. Rehabilitation usually involves gradually rebuilding the knee’s ability to tolerate load before progressing back to normal running.
How Is Running-Related Knee Pain Assessed?
A good assessment should consider more than the painful area. It may include:
Your recent training history
The location and behaviour of your symptoms
Knee and hip movement
Muscle and tendon strength
Balance and control
Running-specific tasks
Previous injuries and rehabilitation
At Light Blue Clinic, we can also use VALD force plates and dynamometry where appropriate. This provides objective measurements of strength, force production and side-to-side differences rather than relying on observation alone.
These measurements can establish a baseline, guide exercise selection and be repeated later to monitor your progress.
What Does Rehabilitation Involve?
Your rehabilitation should be specific to the diagnosis, your current capacity and your running goals. It may include:
Managing running volume and intensity
Progressive knee and hip strengthening
Calf and tendon loading
Balance and movement-control exercises
Plyometric preparation
A gradual return-to-running programme
Repeat strength or performance testing
For common conditions such as patellofemoral pain, strengthening the knee and hip forms an important part of evidence-based management. The programme should progress as your symptoms and physical capacity improve.
When Should You Seek Help?
Arrange an assessment if your knee pain:
Continues despite reducing your training
Repeatedly returns when you run
Is affecting walking, stairs or everyday activity
Is accompanied by persistent swelling
Prevents you from progressing your training
Followed a significant twist, fall or impact
Seek urgent medical advice if the knee is badly swollen or visibly deformed, you cannot bear weight, it locks or repeatedly gives way, or it becomes hot and red while you feel unwell.
Knee Pain Assessment in Cambridge
At Light Blue Clinic, we combine clinical assessment, rehabilitation and objective performance testing to help runners understand their symptoms and return to training with confidence.
Learn more about our knee-pain service:
Or book an assessment at our Cambridge or Girton clinic:
I chose chronic pain specialists in Rhode Island because I needed experienced support for discomfort that had continued for some time. They carefully discussed my symptoms and available management options. I appreciated the compassionate approach and personalised recommendations. https://paincenterofri.com/