Symptoms of knee osteoarthritis are not obvious at the beginning, and as the disease progresses, different degrees of joint pain, swelling, restricted movement and deformity will appear. 1. Joint pain: at the beginning, the pain is mild to moderate and not persistent, but in the middle stage, it will affect walking, and in the late stage, it will develop into persistent pain, even affecting sleep. 2. Swelling of joints: mostly caused by osteophytes or joint effusion. 3. Restriction of movement: It is not obvious in the early stage, only in the morning, the joints will be stiff for a short time, and in the late stage, the joint movement is obviously restricted. 4. Joint deformity: It is not obvious in the early stage, but with the aggravation of the disease and the thinning of the cartilage layer, it will lead to joint deformity, such as exotropia, entropion and so on. If the knee joint has the above symptoms, it is recommended to go to the hospital in time.