A thread after Achilles tendon surgery may be the occurrence of postoperative thread, the common reasons for the occurrence of postoperative thread are the individual’s physical condition, local tension or decompensation is not in place, the method of internal suture is not in place, improper care and so on. 1. Individual physique: some people are prone to postoperative stitching because of their physique, no matter it is absorbable or non-absorbable suture, postoperative stitching will occur and threads will appear. 2. High local tension or inappropriate decortication: Due to high local tension or inappropriate decortication, the scar of the incision becomes wider and thinner, and the deep internal suture line is gradually revealed, resulting in postoperative thread discharge reaction. 3. Inadequate internal suture method: too shallow internal suture, leaving the thread too long, etc. will lead to the occurrence of thread reaction, and a thread is found after Achilles tendon surgery. 4. Inadequate care: Inadequate care can also lead to widening and thinning of the scar and exposure of the internal suture, resulting in the emergence of a thread and the occurrence of a thread reaction. It is recommended to go to the hospital in time to remove the stitches after Achilles tendon surgery.