The common causes of driver’s knee pain are prolonged maintenance of a posture, chondromalacia patella, lumbar disc herniation, trauma and so on. 1. Keep a posture for a long time: drivers often drive knee joints will keep the posture of flexion for a long time, resulting in slow blood circulation in the knee joints, metabolic products can not be taken away by the blood circulation in a timely manner, the joints and muscles will become stiff, soreness and pain. 2. Chondromalacia patella: Repeatedly driving in the same position will bring a lot of wear and tear to the knee joint, over time, the patellar cartilage may wear and tear and cause pain, and in severe cases, osteoarthritis will occur. 3. Lumbar disc herniation: prolonged sitting may lead to degeneration and herniation of lumbar discs, which presses the nerve roots innervating the lower limbs, causing lumbar pain, radiating pain and numbness in the lower limbs, and also knee pain. 4. Trauma: such as the knee by the external force caused by local soft tissue injury or fracture, can cause knee pain, swelling and limited activities. There are many other causes of driver’s knee pain, such as lower limb vascular disease, rheumatoid arthritis, bursitis, etc., if the rest does not relieve, it is recommended to go to the hospital, improve the examination to clarify the cause of the disease, and comply with the doctor’s instructions for targeted treatment, so as not to delay the condition.