Which of the following conditions is associated with headaches in pregnancy?

Preeclampsia is a condition characterized by high blood pressure and often includes protein in the urine after the 20th week of pregnancy. One of the hallmark symptoms of preeclampsia is the presence of headaches, which can range from mild to severe. These headaches may be new in onset or significantly different from any headaches the patient experienced prior to pregnancy. The mechanism behind these headaches is thought to be related to high blood pressure and cerebral edema.

In contrast, while gestational diabetes, placenta previa, and hyperemesis gravidarum may lead to various symptoms during pregnancy, they are not typically associated with headaches. Gestational diabetes primarily affects glucose metabolism, placenta previa is related to the positioning of the placenta, and hyperemesis gravidarum involves severe nausea and vomiting, none of which directly correlate with headache symptoms in the way that preeclampsia does. Thus, recognizing the association of headaches with preeclampsia is critical for timely diagnosis and management, making it the correct answer.