If the thyroid gland is found to be small when a test is done, how is this situation handled. First of all, if the thyroid gland is found to be small or atrophic, it is important to review the thyroid ultrasound and measure the thyroid function. If the size of the thyroid gland is small, but there is no obvious functional change, that is, the level of thyroid hormone is in the normal situation, you can clinically observe, and regular recheck ultrasound and thyroid function will be fine. If there is a small size and complication of hypothyroidism, this situation should be targeted medication, due to the insufficient secretion of thyroxine, we need to use replacement therapy, the commonly used drugs in the clinic are eugenol and thyroxine tablets. Thyroid function should be checked regularly when taking the medication, and the medication should be increased or decreased appropriately according to the change of the condition and the level of the function.