Why does knee pain occur when squatting and climbing stairs?

When you squat or climb stairs, your knees bend a lot and the kneecap (patella) shifts and presses against the thigh bone. This pressure can stress the cartilage and soft tissues underneath the kneecap, causing pain. One type of knee pain that can develop is called patellofemoral pain syndrome. This happens when the pressure on the patellofemoral joint is higher than usual, leading to irritation and discomfort. Some reasons for this extra pressure include muscle weakness, imbalances around the knee, and even how the kneecap moves during the activity. Squatting and stair climbing are both repeated motions that can overload the joint if the muscles around the knee are not strong enough or the movements are not done with proper form. If you're experiencing persistent knee pain and want to better understand what might be causing it, you can take a free symptom checker quiz to get personalized insights. Exercises that strengthen these muscles and improve movement control might help reduce the pain by supporting the knee better and spreading out the forces during movement.