Runner’s knee can be caused by a few different conditions, but technically speaking, it’s “any kind of irritation of the knee, particularly around the kneecap area or the tendons that support the knee,” said Nirav Pandya, MD, associate professor of orthopaedic surgery at UC San Francisco. The term itself, a catchall for a few different issues, is almost amusing; runners experience knee pain so often, they’ve given it its own shorthand terminology. It would be amusing if it wasn’t such a painful, stubborn, and common issue. We won’t waste any time: you want solutions and we’ve got them. Here’s what typically causes runner’s knee and how (at last!) to treat it.