Every runner eventually asks the same question: Is this normal soreness… or the start of an injury?

Knowing the difference is one of the most important skills you can develop as a runner. In fact, research shows that over half of runners experience an injury within a year. The ability to interpret your body’s signals isn’t just helpful; it’s essential for long-term performance and longevity.

This guide will help you understand the difference between soreness and pain, recognize common running injuries, and confidently decide when to run, when to scale back, and when to seek help.

If you love high-impact activities like running, jumping, CrossFit, martial arts, or competitive sports, you probably know what knee pain feels like. For some, it’s a dull ache after a long run. For others, it’s a sharp pain that flares up during squats, box jumps, or takedowns. While high-impact training can keep you strong and conditioned, it also puts a lot of stress on your knees - especially if there are weak links elsewhere in your movement chain.

As a physical therapist, I want you to know that you don’t have to live with knee pain or stop doing what you love. The key is managing your pain smarter, not just “pushing through it.”