There is no relationship between knee pain and the heart. Common causes of knee pain can be rheumatoid arthritis, gout, osteoarthritis, and trauma. If you suffer from rheumatoid arthritis, it can lead to synovial membrane hyperplasia in the joints, causing joint effusion, which leads to joint swelling and pain. Gout can lead to joint swelling and pain, mainly due to a long-term high purine diet such as seafood, which can lead to increased uric acid in the body and cause gout, with pain in the knees, toes and other parts of the body. For middle-aged and old people, the degeneration of joint cartilage can lead to narrowing of the joint space and cause osteoarthritis, resulting in joint swelling and pain. In addition, traumatic injuries such as sprains and chronic sports injuries can lead to meniscus injuries in the joints, resulting in symptoms such as meniscus pain and rupture. Therefore, there is no direct relationship between knee pain and heart disease. It is recommended to go to the hospital in time to clarify the cause of knee pain and treat it under the guidance of the doctor.