Hoarseness after thymoma surgery may be related to intraoperative damage to the recurrent laryngeal nerve, injury from tracheal intubation, and nerve invasion by the thymoma itself. 1. Intraoperative damage to the recurrent laryngeal nerve: If the recurrent laryngeal nerve is accidentally damaged during the surgery for thymoma, it may lead to hoarseness after the surgery. 2. Damage of tracheal intubation: tracheal intubation and anesthesia may be carried out during the surgery. If improper operation during tracheal intubation leads to damage of the larynx, it may also lead to hoarseness of voice after the surgery. 3. Invasion of nerve by thymoma itself: if thymoma itself compresses or invades the recurrent laryngeal nerve, it may also cause hoarseness. Therefore, if hoarseness occurs after thymoma surgery, it may be related to all the above situations, and you should consult doctor for review in time.