Pain in different parts of the knee joint may be caused by strenuous exercise, or may indicate arthritis of the knee, meniscus injury and other diseases. 1. Strenuous exercise: After strenuous exercise, it may lead to local muscle spasm and symptoms of pain in the knee joint and surrounding areas, which are normal phenomena and can be relieved after resting for a period of time. 2. Knee arthritis: patients with knee arthritis may experience pain and swelling in the knee joint, the initial stage is mostly non-sustainable mild to moderate pain, which can be relieved after resting, and the symptoms of joint pain can be aggravated when the weather is cold. As well as the symptoms of limited joint activity, mostly manifested in the knee joint for a long time in a fixed position, after changing position for a short period of time inflexibility. 3. Meniscus injury: meniscus injury patients mainly manifested as the affected knee joint pain, swelling, joint popping, the degree of pain varies in size, can be in the twisting or rotating action after the aggravation of pain symptoms. There are many causes of knee pain, and it is recommended that patients find out the causes of the disease in time.