Synovitis of the knee and meniscus injury are two different diseases with different treatments. Synovitis can be treated with medication, infrared physical therapy, heat, and surgery. Meniscus injury of the third degree can be treated conservatively, if necessary, surgical treatment. Synovitis can be treated with anti-inflammatory and pain-relieving medications under the guidance of a doctor, such as meloxicam tablets, as well as infrared physiotherapy and hot compresses to help absorb the synovial inflammation and relieve the symptoms. When conservative treatment is not effective or the situation is serious, surgical treatment is recommended for synovial membrane cleaning. Third-degree meniscus injury can be treated with anti-inflammatory and analgesic western medicines such as ibuprofen and diclofenac sodium under doctor’s guidance, as well as Chinese patent medicines such as Shujiweiweiqi capsule and Sanqi tablets that activate blood circulation and remove blood stasis, reduce swelling and relieve pain, so as to improve the symptoms of pain and swelling of the joints. If medication is not effective, arthroscopic minimally invasive surgery is recommended. In case of synovitis and meniscus injury, please go to the hospital in time, and the doctor will formulate a treatment plan according to the specific condition.