Knee joint effusion symptoms are as follows: 1, knee joint effusion, if relatively light, there may be no symptoms, because the normal knee joint cavity, in fact, there is also lubricating fluid; 2, if the effusion is a little more, you will feel the swelling of the joints, the activities of the joints, but generally does not affect the normal life; 3, if it is more serious, the swelling is more pronounced, the squatting will be limited, the action will also be affected; in addition to the swelling, the patient will have other Symptoms, such as osteoarthritis, in addition to joint pain, swelling, there will be other ligament or soft tissue around the knee joint injury, there will be pain in other locations; 4, for internal diseases caused by the knee joint cavity effusion, such as rheumatism, rheumatoid, but also involves the fingers, shoulders, ankles, and so on, there will be wandering pain; 5, for tuberculosis or infections, joints and fever, or even the whole organism will have fever symptoms. There are symptoms of fever. So knee joint effusion symptoms are different, mainly related to the original disease.