1, thyroid function abnormalities occur within one year after delivery, can manifest hyperthyroidism hypothyroidism biphasic, hyperthyroidism or hypothyroidism monophasic 2, TRAb negative 3, most of the self-limiting process 4, hyperthyroidism generally do not need anti-thyroid drug treatment, hyperthyroidism severe can be given with beta-blocker symptomatic treatment 5, hypothyroidism period serum TSH “10mIU/L, do not need thyroid hormone replacement, can be self-recovery 6, the risk of permanent hypothyroidism within 5-10 years after delivery. The risk of permanent hypothyroidism increases significantly within 5-10 years after delivery, so it is recommended to check TSH every year.