Hashimoto’s thyroiditis does not usually cause calcium deficiency. Hashimoto’s thyroiditis is an autoimmune thyroid disease and the most common cause of hypothyroidism. As a result of autoantibody damage, the diseased thyroid tissue is infiltrated by large numbers of lymphocytes and plasma cells. Patients with Hashimoto’s thyroiditis tend to present with painless, diffuse goiter, normal thyroid function in some patients, and hypothyroidism in others. Larger glands may produce symptoms of compression, but generally do not cause hypokalemia. If Hashimoto’s thyroiditis is diagnosed, early and standardized treatment is recommended to minimize the adverse effects of the disease.