Frontiers Hypothyroidism is a causal determinant of age related cataract risk in European population: a Mendelian randomization study Hyperthyroidism: Symptoms, Causes and Support Strategies Graves' disease is more than an overactive thyroidit can impact your vision, energy, sleep, and more. Learn the symptoms, causes, and treatment options so you can better understand what's happening and what Chapter 19: Medical Treatment of Feline Hyperthyroidism Veterian Key Graves' disease impacts the body by causing the immune system to attack the thyroid gland, leading to an overproduction of thyroid hormones. This excess can trigger a wide range of symptoms, including