There are many causes of ligamentitis, such as trauma, cold or strain, infection, and joint diseases. 1. Trauma: If local trauma is not cured in time, it can become chronic traumatic inflammation, which affects the function of joints, and therefore may cause limited joint movement. 2. Cold or strain: Cold caused by not paying attention to warmth in daily life, or chronic strain caused by sitting or standing for a long time, can cause ligamentitis. 3. Infection: Ligament infection, such as viral infection, bacterial infection, etc., can induce ligamentitis, and will cause symptoms such as limited joint movement and pain. 4. Joint diseases: rheumatoid arthritis, rheumatoid arthritis, degenerative osteoarthritis and other diseases can cause deformation of the joints, and at the same time involve the ligaments around the joints, which will induce ligamentitis. There are many causes of ligamentitis, after the discovery of the disease should go to the hospital in a timely manner to improve the examination, in accordance with the doctor’s instructions to take standardized treatment, do not ignore the symptoms, to take it lightly.