Pain in the right shoulder and right armpit 11 years after thyroid cancer surgery is usually not related to thyroid cancer, but may be related to shoulder strain, over activity, inflammation and other diseases. After thyroid cancer surgery, shoulder and underarm pain may occur due to scarring, nerve pulling, recurrence of thyroid cancer, etc. However, it usually occurs in the early postoperative period, and the above situation usually does not occur 11 years after the surgery, so the pain is generally not related to thyroid cancer. If shoulder strain occurs, such as frozen shoulder, etc., or over-activity of the shoulder, it will lead to shoulder pain, and if paronychia, lymphadenitis, sebaceous cyst infection occurs in the armpit, the armpit will be painful, it is recommended to go to the hospital, and you can improve the examination of X-ray of shoulder, ultrasound of armpit, etc., and combined with the physical examination, the cause is usually able to be clarified.