The symptoms of hyperemesis gravidarum typically show up within the first trimester, between the fourth and sixth week of pregnancy. In most cases, the intensity peaks between the ninth and thirteenth week before dropping off in the 14th to 20th weeks. Some women have hyperemesis gravidarum throughout their entire pregnancy, however, and must deal with it on a daily basis. Up to 20 percent of women require care through to the very end of their pregnancy, and only experience relief after their child is born.
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