Which of the following is a severe symptom of hypertensive disorders in pregnant women?

A severe headache is a significant symptom of hypertensive disorders in pregnancy, specifically associated with conditions such as preeclampsia and eclampsia. This type of headache is not typical and may be described as intense, persistent, or debilitating, differing from common headaches. It indicates increased intracranial pressure or potential cerebral edema, which can be life-threatening and requires immediate medical evaluation and intervention. Recognizing a severe headache as a warning sign can prompt timely management, potentially preventing complications for both the mother and fetus.

In contrast, persistent leg swelling and mild abdominal discomfort could be more common in pregnancy and do not necessarily indicate a severe hypertensive disorder. Occasional breathlessness may also occur within a normal range in pregnancy due to various physiological changes and might not signify severe hypertension. Thus, the identification of severe headache is crucial in the context of hypertensive disorders to ensure proper care is provided.