Why Does My Knee Hurt When I Run?
Short Answer
Knee pain during running can occur for many reasons, but it is often related to how much stress the knee is being asked to handle compared to what it is currently prepared to tolerate.
Many runners assume knee pain means something is damaged or that running itself is bad for their knees. In reality, symptoms are often influenced by factors such as training volume, running intensity, recovery, strength, previous injuries, and recent changes in activity. Dr. Ethan Marler, Chiropractor, frequently helps runners understand that knee pain is usually less about finding one "broken" structure and more about understanding why the knee is struggling to keep up with current demands.
Why This Question Matters
Running places repeated forces through the entire lower body.
With every step, the knee works together with the:
Foot
Ankle
Calf
Hip
Pelvis
Trunk
to absorb and generate force.
Knee pain may develop when:
Running volume increases quickly
Speed work increases
Hill training increases
Recovery decreases
Strength capacity is insufficient for current demands
Previous injuries influence movement tolerance
Training changes occur too rapidly
Common running-related knee complaints include:
Pain around the kneecap
Pain below the kneecap
Pain along the outside of the knee
Pain during hills
Pain after longer runs
Pain that develops gradually over time
In many cases, knee pain is not caused by a single event. Instead, it develops gradually as workload and capacity become mismatched.
What May Help
If knee pain develops while running, consider asking:
Has my training changed recently?
Am I running more frequently?
Have I increased speed work?
Have I increased hills?
Has my recovery changed?
Did symptoms start after time away from running?
Many runners benefit from:
Temporarily modifying training volume
Managing intensity appropriately
Maintaining strength training
Monitoring symptom response
Gradually progressing activity
The goal is often not to stop running forever. The goal is to identify what level of running is currently tolerable and build from there.
Dr. Marler’s Approach
Dr. Marler enjoys working with runners because running is often an important part of a person's health, identity, and lifestyle.
When assessing running-related knee pain, he often evaluates:
Running history
Training volume
Recent workload changes
Previous injuries
Activity tolerance
Strength capacity
Recovery habits
Functional limitations
Rather than focusing solely on the painful area, he typically looks at the bigger picture:
What demands is the runner facing?
What changed before symptoms began?
What capacity is currently available?
What goals is the runner trying to achieve?
Treatment may include chiropractic adjustments when appropriate, soft tissue therapy, movement recommendations, rehabilitation strategies, and education.
The goal is to help runners return to meaningful activity while building the capacity required to tolerate running long term.
When to get Assessed
It may be worth booking an assessment if:
Knee pain is affecting your running consistency
Symptoms continue despite modifying training
Pain is worsening
Running goals are being limited
Symptoms keep returning
You are unsure how to safely progress training
When to Seek Urgent Medical Care
Seek prompt medical assessment if:
Significant swelling develops
The knee locks or gives way repeatedly
Symptoms follow significant trauma
Weight-bearing becomes difficult
Pain is severe or rapidly worsening
Frequently asked questions
-
No, running is not inherently bad for your knees.
This is one of the most common myths runners hear. Many people assume that repeated impact automatically causes knee damage or arthritis. However, research has generally shown that recreational running is not associated with higher rates of knee arthritis compared to the general population.
The body adapts to the demands placed upon it. Running exposes the knees to repeated forces, but it also helps maintain strength, cardiovascular fitness, and overall physical capacity.
Dr. Marler often explains that the more useful question is not whether running is bad for your knees, but whether your knees are currently prepared for the amount of running you are doing.
Many runners successfully participate in the sport for decades when training is progressed appropriately.
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Not necessarily.
Pain does not automatically mean running must stop completely. Many runners benefit from modifying training rather than eliminating it altogether.
Possible modifications may include:
Reducing mileage
Adjusting pace
Limiting hill training temporarily
Increasing recovery
Cross-training when appropriate
The best approach depends on symptom severity, duration, and how symptoms respond to activity.
Dr. Marler often helps runners identify a level of activity they can currently tolerate while rebuilding running capacity. The goal is usually to maintain meaningful activity whenever possible rather than choosing between complete rest and pushing through worsening symptoms.
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Downhill running places different demands on the body than flat running.
When running downhill, the muscles around the knee often work harder to control the body's descent and absorb impact forces. This increased demand can sometimes aggravate symptoms, particularly when:
Training volume has increased
Hill running was added recently
Strength capacity is limited
Existing knee irritation is present
Many runners notice symptoms primarily during downhill sections while feeling relatively comfortable on flat terrain.
This does not necessarily indicate serious damage. It may simply suggest that current capacity does not yet match the demands of downhill running.
Dr. Marler often considers how symptoms behave on different terrain when helping runners understand what may be contributing to knee pain.
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Hip strength and capacity can influence how forces are managed during running.
The hip muscles play important roles in:
Stability
Force production
Force absorption
Single-leg control
However, Dr. Marler generally avoids overly simplistic explanations such as "your knee hurts because your hips are weak."
Running-related pain is usually influenced by multiple factors. Strength may be one contributor, but training load, recovery, previous injuries, running history, and overall capacity often play important roles as well.
The goal is not simply to strengthen one muscle group. The goal is to improve the body's overall ability to tolerate running demands.
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There is no guaranteed way to prevent every injury, but several strategies may help reduce the likelihood of recurring knee pain.
These often include:
Gradual training progression
Consistent activity levels
Appropriate recovery
Strength training
Avoiding large spikes in workload
Returning gradually after time off
Many running injuries occur when the body is exposed to more stress than it is prepared to handle.
Dr. Marler often encourages runners to focus less on finding the perfect shoe, perfect running form, or perfect exercise and more on consistently building the physical capacity required for their goals.
A resilient runner is often one whose training progresses appropriately over time.