Swelling below the knee can be caused by synovitis, or it can be due to trauma and arthritis. Treatments include conservative treatments and surgical treatments. 1. Synovitis: Synovitis of the knee may lead to the symptoms of swelling below the knee, patients can carry out rehabilitation training of the knee joint to strengthen the strength of the soft tissues around the knee joint to maintain the stability of the knee joint. Physical therapy such as deep microwave and red light irradiation can also be carried out to accelerate the blood around the knee joint; oral ibuprofen, meloxicam and other medications can also be taken to reduce the inflammatory response in the knee joint. 2. Trauma: Knee trauma can also lead to symptoms of swelling below the knee. If it is a soft tissue injury around the knee, physical therapy can be carried out to promote the body’s tissue repair; oral medication such as meloxicam and indomethacin can also be taken to alleviate the symptoms. If there is a fracture of the knee joint, meniscus tear, etc., most of the recommendations for surgical treatment, such as arthroscopic meniscus repair, incision and restoration of internal fixation and so on. 3. Arthritis: Knee arthritis includes osteoarthritis, rheumatoid arthritis and gouty arthritis, which can cause swelling below the knee due to cartilage and synovial surgery. Arthroscopic synovial cleaning is needed for different diseases. Oral glucosamine and ibuprofen can also be taken to treat osteoarthritis, methotrexate and other drugs to treat rheumatoid arthritis, and colchicine and other drugs to treat gouty arthritis. If the symptoms of swelling below the knee are not relieved, or accompanied by other symptoms, you should go to the hospital to see a doctor to identify the cause and then give targeted treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.