7.Runner’s Knee
You’ll feel this in the front of your knee, around the kneecap. Your knee may hurt after you sit with it bent for a while or when you try to kneel. It may pop or crack when you climb stairs. Typically, patellofemoral pain syndrome comes from overuse, misalignment between your hip and ankle, a weak thigh muscle, or the breakdown of cartilage behind your kneecap — or a combination of these. It’s common in women and young athletes.
8.Baker’s Cyst (Popliteal Cyst)
This fluid-filled sac at the back of your knee may bulge out or get so tight that it’s hard to fully bend or stretch your leg. It may be caused by another problem, like arthritis or a tear in your meniscus. The cyst itself usually doesn’t hurt unless it bursts, which can make the back of your knee and calf swell and bruise.
