This article begins with the case study of a 55-year-old woman with Graves' disease, the most common cause of hyperthyroidism. Graves' disease can affect patients of either sex or any age, but it is most prevalent in women ages 20 to 50. Common symptoms include thyroid changes, nervousness, irritability, weakness, weight loss, heat intolerance, disordered sleep, heart palpitations, tremor, and bilateral ocular discomfort; however, patients 55 or older may present atypically. Antithyroid medications, radioactive iodine, and surgery are the treatment options, and the disease can be successfully managed with careful monitoring.