Tightness in the heel after Achilles surgery may be caused by joint stiffness, Achilles tendon contracture, plantar fasciitis and so on. 1. Joint stiffness: after heel surgery, patients will experience tightness in the heel due to joint stiffness after a long period of inactivity. 2. Contracture of Achilles tendon: after Achilles surgery, patients have the phenomenon of tightness in the heel, which may be caused by contracture of the Achilles tendon, at this time, the muscle and ligament tissue length, flexibility and so on will change, thus this symptom occurs. 3. Plantar fasciitis: plantar fasciitis is a sterile inflammation of the tendons or fascia on the bottom of the foot, and patients may experience heel pain and tightness. When patients experience heel tightness after heel surgery, it is recommended that they seek medical attention in a timely manner so that a professional doctor can make a diagnosis and provide reasonable treatment.