Hot packs are not recommended within 72 hours of a meniscus injury; cold packs can be applied intermittently. After 72 hours of acute meniscus injury, recovery period or chronic meniscus injury, can be treated with hot compresses. Meniscus injury within 72 hours for the acute stage, acute meniscus in the bleeding, edema, hot compresses will aggravate the bleeding and swelling, resulting in injury aggravation, while the cold compresses can shrink the synovial blood vessels, reduce tissue exudation. Therefore, it is recommended to apply cold compresses intermittently during the acute phase of meniscus injury, and hot compresses are not recommended. After the acute stage is over and the exudation stops, hot compresses can be applied. Hot compresses can promote the blood circulation in the knee joint, which is helpful for the repair of the damaged meniscus, and can also promote the absorption and subsidence of the inflammatory oedema in the knee joint, thus relieving the pain in the knee joint. Therefore, it is recommended to apply hot compresses after the acute stage. Meniscus injury knee joint effusion should go to the regular hospital in time for examination and diagnosis, under the guidance of the doctor for treatment.