Hypothyroidism (underactive thyroid) is more common in people with Down syndrome. About 40% of the adolescents and adults with Down syndrome we have seen at our clinic have hypothyroidism. One of the Frontiers Persistent symptoms in euthyroid Hashimoto's thyroiditis: current hypotheses and emerging management strategies The 9 Best Supplements for Hashimoto's Thyroiditis Hashimoto's vs. Hypothyroidism: Understand the Difference the biostation Thyroid hormones Wikipedia Does Hypothyroidism Cause Headaches? PrimeHealth Denver