由于人们生活水平和健康意识的提高,也由于公众医疗条件的改善,过去医学教科书中描述的严重甲减症的典型临床症状,如嗜睡、黏液性水肿等在今天的临床上已较少见到。相反,临床医生见到的常常是轻度甲状腺功能减退患者。与严重甲减患者不同的是,亚临床甲减患者的血清三碘甲状腺原氨酸和四碘甲状腺原氨酸水平正常,仅血清促甲状腺激素(TSH)水平轻度增高,且多数患者无明显临床症状,仅少数患者有轻微症状或非特异症状。这些患者往往因常 Due to the improvement of people’s living standards and health awareness and the improvement of public medical conditions, the typical clinical symptoms of severe hypothyroidism described in medical textbooks in the past such as drowsiness and mucinous edema have been less well seen in clinical practice today . In contrast, clinicians often see patients with mild hypothyroidism. In contrast to patients with severe hypothyroidism, serum triiodothyronine and tetraiodothyronine levels were normal in subclinical hypothyroidism, with only mild elevated levels of serum thyrotropin (TSH), and most had no significant effect Clinical symptoms, only a few patients have mild or nonspecific symptoms. These patients are often due to regular