Knee Pain is caused by reasons that are usually not related to any underlying conditions. Some common causes are heavy physical activity or lack of knee use. Some other reasons are sprain or strain or sitting on knees for a prolonged period among others.

Some other causes can be:

• Sprained knee ligaments– Any kind of injury to a knee ligament can cause knee pain. An unnatural twist to the knee joint is the common cause of a Sprained knee. The Sprained knee can cause aches, coupled with swelling and make simple activities like running or jumping difficult.
• Inflammation– Tendonitis or inflammation of the tendon can occur after overuse of the tendon or knee joint. Certain activities like excessive running, jumping, cycling or sports like basketball or athletics can strain the tendon in the knee joint.
• Infection in the bones on the knee- Osteomyelitis is a kind of bone infection that is caused by some specific germs or bacteria. This infection can commence after bone surgery.
• Baker cyst– A baker cyst is a build-up of joint fluid below the knee. It creates a cyst below the knee. Baker cyst commonly occurs in patients with knee arthritis, a tear in meniscal cartilage knee or Cartilage injuries.
• Fracture– Sometimes knee injury causes fracture in the kneecap and other bones that promotes knee pain and swelling.