Lit Matters #1: Is pregnancy a "red flag" for headaches?

Pregnancy alone may not make headache more likely to have a serious secondary cause in the ED. In this international HEAD study analysis, pregnant patients had a similar overall rate of dangerous headache pathology as non-pregnant women and men, though the differential still shifts toward pregnancy-specific diagnoses.

Headache Risk in Pregnancy

• Overall serious headache rate: Serious secondary headache occurred in about 5.1% of pregnant patients, essentially similar to non-pregnant women at 4.8% and men at 6.4%.
• Pregnancy-specific differential: The rate may be similar, but the pathology is not interchangeable; preeclampsia and other obstetric causes stay on the list even when pregnancy itself is a weak standalone red flag.
• Typical dangerous presentations: Pregnant patients with serious pathology still tended to declare themselves with classic warning patterns, including thunderclap headache in cases of subarachnoid hemorrhage.
• Named serious diagnoses: The serious cases in pregnancy included preeclampsia, subarachnoid hemorrhage, intracerebral hemorrhage, and intracranial hypertension, a mix worth keeping in mind at the bedside.
• Study signal and caution: This was a multicenter international cohort, but only 117 pregnant patients were included and just 6 had serious secondary headache. We get into what that means for bedside confidence in the episode.
• Bedside takeaway: A careful history and neurologic exam still matter more than pregnancy status alone, while maintaining vigilance for entities known to be more common in pregnancy such as cerebral venous thrombosis.