Plummer's Disease, also known as toxic multinodular goiter, is a condition characterized by the overproduction of thyroid hormones due to multiple nodules in the thyroid gland. This can lead to symptoms of hyperthyroidism, such as weight loss, increased heart rate, and anxiety. It is more common in older adults and can be associated with iodine deficiency. The exact cause of Plummer's Disease is not fully understood, but it often develops in individuals with a history of goiter or thyroid issues. Diagnosis typically involves blood tests to measure hormone levels and imaging studies to assess the nodules. Treatment options may include medication, radioactive iodine therapy, or surgery.