1, rheumatoid arthritis, knee joint pain can occur, but rheumatoid arthritis is more common in young adults, the lesions mostly involve small joints, single joints are rare, and may be accompanied by joint swelling, morning stiffness, abnormal changes and so on.

2. Soft tissue injuries around the knee joint, including muscle ligament strain. There are lateral ligaments on both sides of the knee joint, cruciate ligament on the back, meniscus in the middle, and countless ligaments and tendons around the knee joint cavity.

3. Degeneration of knee joint is usually called hyperosteogeny. After 0 years old, the changes of bone structure and composition lead to bone degeneration. In order to maintain normal physiological structure and function, the human body protectively proliferates bones. These hyperplastic bone spurs may face around and stimulate muscles, ligaments, blood vessels, nerves, etc., causing injury and pain, which is called senile osteoarthritis.

It is better to have an examination and treatment as soon as possible.