Can you have both hyperthyroidism and hypothyroidism?

Both hypothyroidism and hyperthyroidism can be distinguished by the thyroid glands' hormone output. In hypothyroidism, the gland is underactive and does not make enough thyroid hormones for the body. Meanwhile, hyperthyroidism occurs in hyperactive thyroid glands that produce too many hormones. A person cannot have both at the same time, but you may switch between the two conditions.