In the case of a postpartum woman presenting with high blood pressure, what is a key sign of potential preeclampsia?

In the context of postpartum women presenting with high blood pressure, a severe headache is a key sign of potential preeclampsia. Preeclampsia is characterized by new-onset hypertension and often involves other significant symptoms, such as headache, visual disturbances, and signs of end-organ dysfunction.

A severe headache in this scenario can be indicative of elevated blood pressure levels affecting the central nervous system, making it a critical symptom to investigate further. Unlike other symptoms listed, a severe headache is often described as a "thunderclap headache" or one that is distinctly severe and different from usual headaches, prompting further evaluation for preeclampsia or other complications.

It's important to identify such symptoms because early recognition of preeclampsia can lead to timely management and intervention, thereby reducing risks for both the mother and the baby. In this scenario, the presence of a severe headache should raise suspicion for potential underlying pathophysiological changes associated with preeclampsia.