Cramps after Achilles tendon surgery are usually caused by compression and pulling on the tendon, prolonged plaster immobilization, inflammatory reaction and so on. 1. Pressure on the tendon: Achilles tendon surgery may cause localized bruising and swelling, which presses on the tendon, causing pain, swelling, cramps and other symptoms. 2. Prolonged external cast immobilization: After Achilles tendon surgery, the Achilles tendon will be immobilized in a cast for a long time, which will restrict the movement of the limb, and cause mild compression of the muscles, resulting in itching and cramps. 3. Inflammatory reaction: Achilles tendon surgery will damage the local tissues, the body will be pathogenic microbial infections, trauma, metabolic reactions and other tissue cell reactions, swelling, pain, cramps and other symptoms. It is recommended that patients go to the hospital for review in time, and pay attention to body care and diet.