Final answer:
After a partial thyroidectomy, the remaining portion of the thyroid gland may still function but at a lower level. This can lead to hypothyroidism and may require medication to replace missing thyroid hormone and regulate thyroid function.
Step-by-step explanation:
After a partial thyroidectomy, the remaining portion of the thyroid gland may still be able to function and produce thyroid hormones. However, the level of thyroid hormone production may be lower than before the surgery, which can lead to a condition called hypothyroidism. Hypothyroidism can cause symptoms such as fatigue, weight gain, and constipation. In some cases, medication may be needed to replace the missing thyroid hormone and regulate thyroid function.