What could cause pain at the front of the knee when going down stairs?

Front-of-knee pain when going down stairs is most often caused by patellofemoral pain syndrome (PFPS), sometimes called "runner's knee." This occurs when the kneecap (patella) doesn't glide smoothly along the thigh bone (femur), creating friction and discomfort—especially during activities that load the joint, like descending stairs, squatting, or sitting for long periods.

Common causes include:

• Weakness in the quadriceps or hip muscles
• Poor kneecap alignment or tracking
• Overuse from running, jumping, or repetitive bending
• Previous knee injury or trauma
• Tight hamstrings or IT band

While PFPS is the most likely culprit, similar symptoms can also point to conditions like chondromalacia patella, meniscus injury, or early osteoarthritis—each requiring different care approaches. Because knee pain has many possible sources, guessing wrong can delay recovery or worsen the issue. A quick, free symptom check can help you identify likely causes based on your specific symptoms and guide you toward the right next steps—whether that's home care, physical therapy, or seeing a doctor. It takes just 3 minutes and could save you weeks of uncertainty.

Reviewed for medical accuracy: 07/14/2026