Your knees have lots of parts, and you use them a lot, so there's plenty that could go wrong. WebMD explains common things that can cause knee pain.

Whether you run, climb, ski, bike, or hike, nagging knee pain may be just around the ... “As long as it’s pain-free, you can do this as often as possible and in as many environments as ...

U.S. Army Staff Sgt. Rayshaun Smith thought his knee pain was caused by his active lifestyle. It was an early sign of a rare ...

When it comes to efficient, pain-free running ... that sit between the knee joints. 'If you apply a twisting force it can potentially tear the meniscus, which then causes pain when you’re ...

Medically reviewed by Stuart Hershman, MD Physical therapy is the top treatment for runner’s knee (patellofemoral pain ...