Nature Clinical Course of Gestational Transient
Hyperthyroidism
In women with hyperemesis gravidarum and gestational
transient hyperthyroidism, the onset of nausea is usually
within the 4 gestational weeks, worsens by the 9th
gestational week and completely resolves by 20th
gestational week. The serum T4 is usually normalized by
15th gestational week, but serum TSH may remain
suppressed until the end of second trimester1,4
.