Metastatic thyroid cancer is not carcinoma in situ. Carcinoma in situ means that the cancer cells are located in the mucosal layer and do not invade down to the muscular layer and break through the plasma membrane layer. Non-metastatic thyroid cancer means that the tumor is confined to the thyroid gland and has not invaded the surrounding lymphocytes or the lungs, abdominal organs, or the head. The disease can be cured through active surgery and later oral treatment, such as levothyroxine sodium tablets, and even if there is some metastasis, the five-year survival rate is higher. After thyroid cancer surgery, you need to go to the hospital for regular follow-up, try not to eat too spicy food, not to drink alcoholic beverages, and to increase exercise to improve your body resistance.