低T_3(三碘甲状腺原氨酸)、T_4(甲状腺素)综合征系由甲状腺以外严重的全身性疾病所引起的血清甲状腺激素低下。现结合5例讨论如下。例1:男,65岁。15年前因患十二指肠球部溃疡穿孔行胃大部切除术,术后1个月出现腹泻(7～8次/日)。10个月后出现双下肢水肿,并渐呈全身性;乏力畏寒,记忆力下降。门诊检查甲状腺摄~(131)碘率低 Low T_3 (triiodothyronine), T_4 (thyroxine) syndrome is caused by a serious systemic disease outside the thyroid serum thyroid hormone low. Now combined with 5 cases discussed below. Example 1: Male, 65 years old. 15 years ago due to duodenal ulcer perforation line gastrectomy, diarrhea after 1 month (7 to 8 times / day). Edema of both lower extremities occurred after 10 months, and gradually became generalized; fatigue, chills, and memory loss. Outpatient examination of thyroid uptake ~ (131) low iodine rate