After bilateral thyroidectomy, there may be hypothyroidism, laryngeal reentry nerve injury, hypocalcemia and other phenomena. 1. Hypothyroidism: Usually, after bilateral thyroidectomy, patients may have insufficient secretion of thyroid hormone, which may lead to hypothyroidism and other related symptoms, such as fatigue, loss of appetite and so on. 2. Laryngeal recurrent nerve injury: patients may experience laryngeal recurrent nerve injury when bilateral thyroidectomy is performed. Such as loss of voice, hoarseness and muffled voice, some patients may also have choking cough. 3. Hypocalcemia: During bilateral thyroidectomy, the parathyroid glands may be mistakenly injured, resulting in hypocalcemia. If the above consequences occur, patients are advised to seek medical treatment in time and take medication under the guidance of professional doctors, and not to take medication privately to avoid adverse effects.