Hyperthyroidism is characterized by an overproduction of thyroid hormones, which accelerates the body's metabolism. This increased metabolic rate typically leads to weight loss, even though patients may experience an increase in appetite. The body’s heightened metabolism also causes heat intolerance, where patients may feel excessively warm or experience excessive sweating.
Weight loss occurs because the metabolic processes are running faster than normal, leading to the breakdown of body fat and muscle for energy. Patients often report an increased appetite as well, driven by the body's demand for more energy, despite the paradox of losing weight. Collectively, these symptoms of weight loss, heat intolerance, and increased appetite are classic manifestations of hyperthyroidism and indicate the systemic effects of elevated thyroid hormone levels.