Leg edema in hyperthyroid patients may be due to mucous edema, right heart insufficiency and microcirculation disorder. 1. Mucous edema: due to autoimmune problems, many patients with hyperthyroidism are prone to mucous edema, mainly due to the accumulation of excessive extracellular mucopolysaccharides, which is often manifested as anterior tibial edema, without depression when pressed, and it is a characteristic sign of hyperthyroidism patients. 2. Right heart insufficiency: if hyperthyroidism patients don’t get regular treatment for a long time, resulting in heart damage, cardiac morphology changes, and then right heart insufficiency, right heart failure, etc., there will be blood stasis in the circulation, which is manifested as leg swelling. 3. Local microcirculation disorder: hyperthyroidism patients are also prone to localized leg swelling if they have lymphatic or venous reflux disorder. It is recommended that patients go to regular hospitals to clarify the causes of leg swelling and follow the doctor’s instructions for treatment.