After meniscus injury, there will usually be pain sensation, obvious swelling of the knee joint as well as unfavorable activities, as follows. 1. Painful sensation: it is often manifested as pain sensation on the inner and outer side of the knee joint during exercise. If the knee pain occurs when going downstairs and there is sound, it may be meniscus injury; when walking on the level road, there is swelling and pain, and the knee joint is often stuck, and there will be sound, which is also a manifestation of meniscus injury. Meniscus injury not only pain, there will be a sound, if the sound and pain at the same time in the knee joint medial and lateral gap, should be suspected of meniscus injury. 2. Obvious swelling of the joints and unfavorable activities: the obvious swelling of the knee joint is caused by the local small blood vessel rupture bleeding and inflammatory exudation, compared with the other side of the knee joint is obviously much thicker, unfavorable activities will also appear in the activities, because of inflammatory foci after the meniscus injury, when the activities of the inflammatory foci will be stimulated, so there is unfavorable activities. The above methods are for reference only, a clear diagnosis should be made in time to the hospital to improve the relevant examinations, such as magnetic resonance examination.