Unilateral knee pain may not be caused by cancer, but may be caused by osteoarthritis, meniscus injury, synovitis and other diseases. If you want to confirm whether it is caused by cancer or not, the patient needs to combine with his own situation and conduct relevant examinations, which can identify the cause of the disease. There are many causes of unilateral knee pain, including osteoarthritis, meniscus injury, synovitis, gout, soft tissue injury and so on. Cancer cannot be identified solely on the basis of the symptom of unilateral knee pain. Bone cancer is a malignant tumor that occurs in bone and cartilage, and its symptoms include local pain, local mass, pathological fracture, joint dysfunction, etc. Patients need to take X-ray examination, CT examination, biochemical measurement, modern biotechnology testing and other methods under the guidance of doctors for comprehensive examination to clarify the cause of the disease. There are many causes of unilateral knee pain, so it is recommended that patients go to regular hospitals, undergo relevant examinations to identify the cause of the disease, and actively cooperate with doctors to take relevant treatment measures.