There are many causes of hyperthyroidism, usually associated with diffuse toxic goiter, multinodular toxic goiter, autonomic high-functioning adenoma of the thyroid, and iodine overdose. If diagnosed, patients need to be treated with oral medication under the guidance of a medical professional.1. Diffuse toxic goiter: One of the most common causes of hyperthyroidism is diffuse toxic goiter, which is usually associated with genetic background, environmental factors, autoimmunity and other causes. In general, high titers of thyrotropin receptor antibodies can be detected in patients. This antibody can lead to increased synthesis and secretion of thyroid hormones, inducing patients to be in a state of high metabolism and high catabolism, and thus suffering from hyperthyroidism. 2. multinodular toxic goiter: Patients will experience increased abnormal synthesis and secretion of thyroid hormones, leading to hypermetabolic symptoms, commonly found in iodine-deficient areas. 3. Autonomous hyperfunctional thyroid adenoma: It is related to the patient’s genetic background, gene regulation disorders and mutations, and the excess of autonomously synthesized thyroxine can lead to hyperthyroidism; 4. 5. Others: If a patient is under prolonged stress, anxiety, or depression, he or she may also suffer from hyperthyroidism. Overdose of thyroid hormone medication can lead to drug-related hyperthyroidism, etc. For hyperthyroidism, no matter what the cause is, the condition should be actively controlled. It is also important to keep your emotions calm and avoid mood swings that can trigger an attack.