Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.

Etiology

Although considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in individuals carrying HLA-DR3 and HLA-B8 alleles, along with family clustering and higher concordance in monozygotic twins.

It is also associated with other autoimmune disorders such as type 1 diabetes and pernicious anemia, indicating underlying immune dysfunction. Environmental triggers may initiate or worsen the disease, including smoking (which significantly aggravates ophthalmopathy), viral infections through molecular mimicry, and possibly emotional stress or excess iodine intake. These factors interact to disrupt immune regulation, leading to B-cell production of TSIs.

Clinical Manifestations

Graves' disease presents with features of thyroid hormone excess along with autoimmune involvement of the eyes and skin.

Patients commonly experience weight loss, heat intolerance, sweating, palpitations, tachycardia, tremors, anxiety, irritability, fatigue, muscle weakness, and menstrual irregularities.

A diffuse goiter may cause visible neck swelling or pressure symptoms. Ophthalmopathy includes exophthalmos, eye dryness, redness, tearing, diplopia, and, in severe cases, visual disturbances or pain.

Less commonly, dermopathy such as pretibial myxedema presents as thickened, discolored skin over the anterior lower legs.