When there is meniscus injury with effusion in the knee joint, it needs to be treated according to the degree of meniscus injury, such as I degree to II degree can be treated conservatively, and III degree or above needs to be treated surgically. 1. I degree to II degree injury: I degree to II degree injury is a relatively mild meniscus injury, generally can be treated conservatively. It can be treated by oral ibuprofen, aspirin and other non-steroidal anti-inflammatory drugs for pain relief, such drugs may have side effects such as gastrointestinal discomfort; at the same time, we should minimize the activities, bed rest, and wait for the fluid to be absorbed slowly. 2. Injury of degree III or above: The symptoms of meniscus injury of degree III or above are more serious, and there may be severe limitation of activities, joint interlocking, subcutaneous hematoma, large amount of fluid accumulation, etc. In addition to the above conservative treatments, it may be necessary to use arthroscopic surgery to repair the meniscus, and at the same time, the fluid in the joint cavity will be extracted out, so as to relieve the pressure of the fluid on the joints. Knee meniscus injury with effusion, it is recommended to go to the regular hospital in time, the professional doctor to determine the condition, choose the appropriate treatment, do not blindly use drugs.