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Knee Pain & Injuries

Is it runner's knee, knee tendonitis, or arthritis? Learn about the causes of common knee injuries, what to do if you have fluid in your knee, and much more.

As a runner, having knee pain can be a real pain in the butt (OK, not really).

Your knees have a thankless job. They bear the brunt of your body weight while helping you walk, run, and move seamlessly—all without much complaining.

The knee is the largest joint in the body, says Dr. Scott Weiss, a licensed physical therapist, board-certified athletic trainer, and exercise physiologist.

If your joints hurt, get in line -- millions of women deal with the pain. But you can stay physically strong, avoid injuries, and even prevent damage with a few simple exercises and our DIY guide.

Prevent injury with these 3 joint-strengthening exercises.

So long, sore knees! To help your joints withstand the jolts of running, try these proven protectors from a new study at the University of North Carolina at Chapel Hill.

Joints often crack and pop during intense exercise — here's why.