Abnormalities in thyroid function, if combined, can cause swelling of the feet, and it is more common for hypothyroidism to cause swelling of the limbs. Hypothyroidism is a generalized hypometabolic syndrome due to hypothyroidism, or thyroid hormone resistance, caused by various reasons. Its pathology is characterized by the accumulation of mucopolysaccharides in the tissues and skin, which manifests as mucous edema. However, this mucous edema is usually non-digestive, and it can not only cause edema of the lower limbs and feet, but also of the whole body and the face. In addition, if the combined hyperthyroidism, long-term course of hyperthyroidism patients do not get timely treatment, if the hyperthyroidism heart disease, resulting in cardiac failure, which will also be manifested in the lower limbs and feet edema.