If the swelling and pain in the knee joint is caused by non-traumatic reasons such as synovitis, it is recommended to take rest; if it is caused by traumatic reasons such as bone fracture, it is recommended to take rest and have proper activities after resting. 1. Non-traumatic: If the swelling and pain in the knee joint is caused by non-traumatic causes, such as synovitis, osteoarthritis of the knee joint or due to overweight, chronic strain, etc., it is necessary to rest, reduce the activities of the knee joint, keep the knee joint rest, if you continue to carry out the activities or line of the knee joint in excessive flexion, it will only lead to swelling and pain in a more serious situation. 2. Traumatic: If the knee joint is swollen and painful due to trauma, such as fracture after fixation, then the early stage also need to rest, but the fracture should be resumed within 2 weeks of the knee activities, so that the muscle strength of the lower limbs to strengthen, promote blood circulation, to prevent muscle atrophy adhesion, after the fracture of the knee joint flexion and extension exercises in 2 to 6 weeks gradually, to avoid stiffness of the knee or contracture and other symptoms. Different causes of knee joint swelling and pain lead to different treatments, so it is recommended to seek medical advice and standardize the treatment.