Hypothyroidism is caused by insufficient production of thyroid hormone by the thyroid gland. Cretinism is a form of hypothyroidism found in infants. From a naturopathic perspective the causes of hypothyroidism are not only nutritional deficiencies of vitamin and mineral precursors to thyroid hormones but also due to environmental contaminants that inhibit thyroid hormone production. The 2 big ones are microplastic and fluoride. Herbal medicine, nutritional supplementation, dietary and lifestyle approaches can treat the thyroid naturally, without the use of pharmacological drugs.