Whether a joint effusion can recover on its own is determined by the severity of the effusion. There are many reasons for the presence of effusion in the joint, such as synovitis, joint degeneration, septic joint infection or rheumatism or rheumatoid factors. Usually the condition is not particularly serious, and with adequate rest and conditioning, the fluid can be absorbed and restored on its own. However, if the joint effusion is large and accompanied by pain and swelling, for example, due to rheumatism or other diseases, active treatment is required to completely cure the condition. If left to its own devices, it may lead to serious sequelae, such as joint stiffness. When joint effusion is found, you should follow medical advice to improve relevant imaging examinations of the joint area, such as MRI and ultrasound, to determine the amount of joint effusion, as well as to improve blood tests, C-reactive protein and other indexes. If the joint effusion is large, joint cavity aspiration can be performed to determine the cause of the disease more precisely.