What causes running injuries?
You know the pattern by now. It hurts at a certain distance, you back off, it quiets down, and it comes back the week you start building again. Running injuries are almost always overuse injuries, and overuse has specific causes: mileage that climbed faster than your tissue could adapt, a stride that sends load somewhere it does not belong, shoes that stopped supporting you, weakness or imbalance that shows up only when you are tired, and intensity that jumped without warning. Find the one that applies to you and the injury stops being mysterious.
Pain around or under the kneecap, worst on downhills and on stairs the next day. The kneecap is not tracking the way it should, usually because the muscles that steer it are imbalanced or the hip is not controlling the leg well at footstrike. This is the most common running complaint there is, and it responds well to strength work once the source of the tracking problem is identified rather than guessed at.
Aching or sharp pain along the shinbone, often after a jump in mileage or a switch to harder surfaces. The impact your stride generates has outpaced what the tissue along the shin can absorb. Backing off helps briefly, but the pain returns at the same point in your build unless the mechanics generating that impact change. Treatment looks at how you strike the ground and what is failing to absorb it.
Stiffness and pain at the back of the heel that is worst in the first few steps of the morning and again at the start of a run. The tendon has been loaded more often than it has been allowed to recover. Tendons do not respond to rest the way muscles do, they respond to loading that is graded carefully, which is why an Achilles that is only ever rested tends to become a long-running problem.
Heel pain that stabs when you first stand up and eases as you move. Stress on the plantar fascia is usually tied to tight calves or footwear that has stopped supporting you, and the two often compound each other. Treatment addresses the calf and ankle, how your foot loads the ground, and what has changed in your shoes, rather than only treating the sore spot on the heel.
Small cracks in bone from repetitive impact without enough recovery. The pain is usually pinpoint rather than diffuse, it gets worse as a run goes on instead of warming up, and it can be sore to press on. This one needs a proper evaluation early, because continuing to train through it makes it worse. If imaging or a physician's input is needed, we will tell you plainly.
Pain on the outside of the knee, often arriving at a predictable distance and then forcing you to stop. Friction between the iliotibial band and the femur is the mechanism, but the reason it is happening is usually further up: hip control that fades as you fatigue. Rolling the outside of your thigh feels productive and rarely fixes it. Building hip strength and adjusting your stride does.
