What is the result of untreated Graves' disease?

Graves' disease is an autoimmune disorder that leads to overactivity of the thyroid gland, resulting in hyperthyroidism. When left untreated, the condition escalates to severe hyperthyroidism, characterized by an overproduction of thyroid hormones, which can significantly impact various bodily systems. This hyperactivity can lead to various complications, one of the most serious being cardiovascular issues such as arrhythmias, hypertension, and in severe cases, heart failure.

Severe hyperthyroidism increases the metabolic rate dramatically, leading to symptoms like rapid heartbeat, weight loss, heat intolerance, and anxiety. These metabolic changes put additional stress on the heart and can contribute to heart-related complications, making monitoring and treatment vital for individuals with Graves' disease to prevent these serious outcomes. Thus, the option correctly identifies the critical consequences of untreated Graves' disease, specifically the risks of severe hyperthyroidism and the potential for associated heart issues.