What might cause knee pain when pressed on?

When you press on your knee and feel pain, there are a few things that might be happening. One common reason is knee osteoarthritis, where the cushioning in the knee is worn out and the joint becomes sore when touched. Another possibility is knee effusion, which means extra fluid builds up inside the knee joint making it swollen and tender. Inflammation due to bursitis could also cause pain. Bursae are small, soft sacs that help reduce friction in the joint, and when they are inflamed, the knee can hurt when pressed. Other causes include bruises, ligament strains, or tendon injuries that occur from falls, twists, or bumps. Each of these issues can make the tissues around the knee sensitive. It can be helpful to watch for signs like swelling, warmth, or changes in how the knee moves. If the pain persists or worsens, you can use Ubie's free AI symptom checker to help identify what might be causing your discomfort and determine whether you should see a doctor.