Swelling and pain on the inner side of the foot and knee may be caused by strain, degenerative joints or trauma to the joints, etc. Patients can be treated by physical therapy, medication or surgery according to the situation. 1. Strain: it may be caused by walking too much, which will cause the soft tissues around the joints to be pulled repeatedly, releasing some inflammatory substances, which will result in the swelling and pain on the inner side of the knee, the patient should pay more attention to rest, and can carry out the local hot compresses, avoiding excessive activities. 2. Degenerative joint changes: mostly seen in middle-aged and old people, related to the wear and tear of the cartilage of the joints, joint space narrowing and other reasons, in the cold after exertion will cause swelling and pain in the inner side of the foot and knee. Patients can take oral non-steroidal anti-inflammatory drugs, or through intra-articular injection of sodium vitrate and other methods of treatment. 3. Joint trauma: If the patient’s joints have suffered more serious trauma, it will also cause the symptoms of swelling and pain in the inner side of the foot and knee, and it is necessary to give the MRI examination in time, and if it is a meniscus injury, it can be treated through minimally invasive arthroscopic surgery, and if it is a ligament tear or avulsion, it can be treated through reconstructive surgery. Patients who experience swelling and pain on the inner side of the foot and knee should seek timely medical examination and targeted treatment under the guidance of the doctor.