Rattling of the Achilles tendon can be caused by aseptic inflammation such as Achilles tendonitis and Achilles tendonitis, or it can be caused by Achilles tendon rupture and osteophytes. 1. Aseptic inflammation: The Achilles tendon is the thickest tendon in the human body, which is formed by the tendons of the flounder muscle and gastrocnemius muscle of the calf, and its stopping point is located in the Achilles node. Prolonged wear and tear can lead to aseptic inflammation of the Achilles tendon and the attachment site of the stopping point. Increased friction during activities can lead to popping of the Achilles tendon, such as Achilles tendonitis and Achilles tendon stopping point inflammation. 2. Achilles tendon rupture: Excessive exercise or excessive pressure beyond the tolerance range of the Achilles tendon can lead to rupture of the Achilles tendon, which is manifested by a brief, low and muffled sound of the Achilles tendon and severe pain in the area of the Achilles tendon during exercise. 3. Bone hyperplasia: When bone hyperplasia occurs at the attachment site of the Achilles tendon, it can cause the Achilles tendon to rub against the bone and impact, resulting in a popping sound of the Achilles tendon, such as Achilles bone spurs, etc. The symptoms of Achilles tendon rattling alone are sometimes not enough. The symptoms of Achilles tendon ringing alone sometimes can not accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results to make an accurate judgment, it is recommended to clarify the cause of the disease under the guidance of the doctor.