Knee Pain When Running: Causes and Fixes
Why your knee hurts when you run, what it usually means, and how to get back to training safely.
What this pattern usually means
Pain that turns on with running and turns off when you stop usually points to a load or mechanics issue. The tissue is irritated but rarely structurally damaged — yet.
What to do today
- Cut volume by 30-50% for 7-10 days
- Drop intensity (no speedwork, no hills)
- Add daily mobility for the affected area
- Replace one run per week with cross-training
When to worry
- • Pain doesn't fade after the first mile
- • Pain worsens as the run goes on
- • Pain lingers into the next day's easy run
Common causes of knee pain
- Runner's knee (PFPS)
- IT band syndrome
- Patellar tendonitis
- Sudden mileage spikes
- Weak hips and glutes
Could it be one of these injuries?
Patellofemoral pain syndrome (PFPS) — 'runner's knee' — is pain around or behind the kneecap from poor tracking and load distribution at the patellofemoral joint. It accounts for roughly a quarter of all running injuries.
IT band syndrome (ITBS) is irritation of the tissue at the outside of the knee where the iliotibial band crosses the femur. The band itself doesn't 'tighten' — the underlying tissue gets compressed and inflamed from repeated knee flexion under poor hip control.
Patellar tendinopathy — 'jumper's knee' — is degeneration of the patellar tendon just below the kneecap. Common in jumpers and sprinters; in distance runners it usually shows up after spikes in hill work or speed.
Other knee pain patterns
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