The difference between mild and severe hyperthyroidism is mainly reflected in the difference in symptoms, with most patients showing mild symptoms. However, it should be noted that the clinical manifestations are atypical, in addition to mild patients, the clinical manifestations of elderly and children’s cases are often atypical, and it is recommended to analyze them together with the results of laboratory and imaging tests. 1. Mild symptoms of hyperthyroidism: most patients have a high basal metabolic rate, which is characterized by excessive sweating, fear of heat, hyperphagia, overeating, but no significant weight gain or even weight loss. 2. Severe symptoms of hyperthyroidism: manifested as easily agitated, abnormal excitement, irritability and insomnia, palpitation, eyeball protrusion, etc., will also show the symptoms shown by mild hyperthyroidism. Patients with hyperthyroidism should reduce the intake of iodine in their diet, and may take medication for hyperthyroidism under the guidance of a doctor. If diagnosed with hyperthyroidism, it is recommended that standardized treatment be carried out as early as possible. For the same disease, patients with different physical conditions and at different stages of the disease, the treatment methods are different, and standardized treatment should be carried out under the guidance of doctors.