It depends on the cause, but generally speaking, no. It can be treated, but generally requires lifelong thyroid replacement in most cases.

Hypothyroid cannot be cured. It is due to destruction of the thyroid producing cells in the thyroid gland & like most other organs it cannot regenerate. But the treatment is easy. One pill a day & once or twice a year get your thyroid (free T4) & TSH checked then adjust you thyroid dose if needed. I have had hypothyroid for 26 years & its no big deal to treat. Don't stop treatment as the consequences of remaing low on thyroid severe to the heart, brain & other organs. Take your pill & be thankful you have it.