Walking knee ringing without pain may be caused by physiological factors, but also may be due to meniscus injury, knee degeneration caused by pathological factors. 1. Physiological popping: part of the population in the activity can appear between the joint surface, cartilage pad and joint surface, tendon and joint capsule and other tissue friction, can appear walking knee ringing without pain symptoms. 2. Meniscus injury: commonly caused by trauma meniscus injury, the patient’s knee in walking and other flexion and extension activities, meniscus and femoral condyles can be collision, which causes the patient to walk knee ringing pain. 3. Degenerative changes of the knee joint: due to long-term wear and tear of the knee joint cartilage degeneration, sclerosis, hyperplasia and other changes, due to the unevenness of the joint surface, in the early stage of the patient can appear walking knee ringing pain, but gradually there will be knee pain, swelling, and even limited activities and other symptoms. There may also be other reasons for walking without knee pain, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.