Knee pain under kneecap when ever i land on it or run

See orthopedic: For an evaluation, before you do more harm to the knee.

Chondromalacia patella: Chondromalacia patella indicates softening of the cartlidge underneath your kneecap. Unless you have a major damage there before you can rectify this with quadricep muscle exercise stretching and find muscles will help the patella glide over the lower part of your femur which is where the top of your knee is. Increasing the tone in this muscle helps protect your knee in lots of settings.

Many possibilities: Your pain could be as a result of many different things. A thorough history and physical exam and possibly some laboratory and radiology exams are needed to determine the exact cause. Causes of pain may include: trauma (fracture, tendon or ligamentous tear, arthritis), infection, metabolic conditions (gout), musculoskeletal or biomechanical abnormalities.

Causes of knee pain: ...Are quite numerous. In a young individual, most knee pains may be related to athletic activities. Some causes in this group would be patellar tendonitis, patellofemoral syndrome, ilio-tibial band syndrome, or osgood schlatters. It's best to be evaluated by a doctor. All the best.