Hypothyroidism actually refers to hypothyroidism, which is typically caused by a decrease in free thyroid hormone levels, a decrease in free triiodothyronine hormone levels, and an increase in thyroid stimulating hormone levels. The most common causes of hypothyroidism are Hashimoto’s thyroiditis, thyroid surgery, iodine-131 therapy, and inflammation of the thyroid gland, all of which can cause low thyroid hormone levels. The treatment is oral replacement therapy with Eugenol, which is taken once half an hour before breakfast, and the thyroid function level will be checked after four weeks, and the dosage of Eugenol will be adjusted according to the results.