The knee is one of the more complex joints in the human body, also called the bursal joint, which contains the medial and lateral menisci, collateral ligaments, cruciate ligaments and patellar ligaments. The causes of knee pain are as follows: 1, trauma, acute injury, chronic strain and other causes; 2, as we get older, degenerative changes will occur in the joint, this trend is inevitable, osteophytes, osteoarthritis or patellar chondromalacia will cause knee pain; 3, rheumatic arthritis, such as rheumatoid, gout and other diseases will cause joint pain; 4, knee joint aspects of the lesion, such as the hip joint Osteoarthritis can cause knee pain. Therefore, in addition to chronic strain, some other diseases may also cause knee pain, which must be diagnosed with the help of modern medical examination and physical examination, and can only be treated after diagnosis. Most of the knee pain is caused by chronic strain injury and wind chill, so if you feel knee pain, you must pay attention to protection, use your joints sparingly, wear knee pads, pay attention to warmth, and try not to climb stairs, hills, squat, etc., because these actions are the most serious damage to the knee joint.