As you bend and straighten, you'll feel a swollen lump like a water balloon and pain behind your knee. If you're an avid runner, that mileage could be to blame.

Nerve flossing, also known as nerve gliding, is a technique that can alleviate knee pain for cyclists. Here’s our expert ...

Dr. Carrie Jose, in her latest Health and Wellness, gives three signs it may something else if your hamstring isn’t healing ...

Pain behind the knee is less common than pain in the front, and is generally easier to trace back to a culprit: over-extending the knee, says Bresnick. Your saddle is too high or too far back.

Popliteal artery entrapment syndrome (PAES) affects an artery behind the knee. Learn about symptoms and causes of the condition, treatment options, and more.

Septic arthritis of the knee can cause severe pain, swelling, and difficulty moving the joint. Treating symptoms usually involves antibiotics and other measures. Learn more.

A: A Baker's cyst is a collection of fluid behind the knee. It was named after a British surgeon, William Baker, who described these cysts in the late 1800s. It's sometimes called a popliteal cyst.