Generalized pain in the knee that can be caused by weakness, instability, or excess forces due to activity.
Many medical conditions can cause knee pain. Some possible causes of knee pain are spending long periods of time on your feet, being overweight, having improper posture (standing or sitting) or having improperly cushioned and supported feet.
The knee can be subject to forces 3-5 times your body weight, especially during bending and in conditions such as stair climbing and descent. Stress on your knee joints can aggravate the tendons and ligaments responsible for the support of the knee and kneecap, causing pain.