What to notice
Useful details include pain during the run or later, recent distance and hill changes, swelling and what happens on stairs. Share these with a physiotherapist or doctor if symptoms persist.
Practical next steps
- Do not keep running through knee pain to see whether it disappears.
- Avoid copying a strengthening or stretching programme before the cause is clear.
- If pain does not settle, arrange an assessment and a suitable return plan.
When to get help
Seek urgent assessment for a badly swollen or deformed knee, inability to bear weight, locking or giving way. A hot, red knee with fever also needs urgent care.

