Hyperthyroidism is hyperthyroidism and hypothyroidism is hypothyroidism. The differences between hyperthyroidism and hypothyroidism mainly include different pathogenesis, different symptoms, different hormone levels and different treatment methods. 1. Different pathogenesis: hyperthyroidism is caused by excessive secretion of thyroid hormones, while hypothyroidism is caused by decreased secretion of thyroid hormones. 2. Different symptoms: Hyperthyroidism is characterized by hypermetabolism, such as fear of heat, sweating, palpitations, etc., whereas hypothyroidism is the complete opposite, characterized by fear of cold, fatigue, constipation. 3. Different hormone levels: T3 and T4 levels are elevated and TSH levels are lowered in patients with hyperthyroidism, while T3 and T4 levels are lowered and TSH levels are elevated in patients with hypothyroidism. 4. Different treatment methods: hyperthyroidism is to reduce the secretion of thyroid hormone through drugs or surgery, while hypothyroidism is to supplement thyroid hormone. If you suspect hyperthyroidism or hypothyroidism, it is recommended to go to the hospital for timely diagnosis and treatment.