The thyroid gland will definitely not grow back after excision. If there is insufficient thyroid function, exogenous thyroxine must be supplemented to avoid hypothyroidism symptoms. As an endocrine organ of the body, the thyroid gland’s main function is to synthesize and secrete thyroxine. Clinically, thyroid disorders usually include thyroid nodules, thyroid adenomas and thyroid cancer. The residual thyroid gland can still synthesize the necessary thyroxine, so it usually does not cause hypothyroidism; 2, thyroid cancer usually undergoes total thyroidectomy, or total excision of the affected side plus total excision of the isthmus plus subtotal excision of the opposite side, which will inevitably cause hypothyroidism, manifesting as weakness and mucinous edema.