What is knee pain?

Knee pain is a common. Sometimes, it occurs acutely, such as when someone falls and tears a ligament. Other times, its onset is slow, due to strain on muscles or ligaments from repetitive motion. It can also come and go, such as when people have bursitis. Sometimes, however, it lasts longer and can become chronic. In most cases of chronic knee pain, it is due to osteoarthritis.