Severe headache in the first trimester: what to know

Hormone shifts, fatigue, stress, reduced caffeine, skipped meals, dehydration, migraine, or a viral illness may contribute early in pregnancy. Nasal congestion can also create facial pressure. Although some blood-pressure complications are more common later, a severe headache still deserves review at any stage. A clinician may need to check blood pressure, hydration, vision, neurological function, and medication use.

Rest in a quiet, dim room, eat regular small meals, and take frequent sips of fluid. Keep a brief record of when the headache began, where it hurts, what makes it worse, and whether nausea, fever, congestion, or visual symptoms occur. Check with your maternity clinician or pharmacist before taking painkillers, cold remedies, supplements, or changing caffeine intake.

Seek emergency care for a sudden extreme headache, fainting, confusion, seizure, new weakness, trouble speaking, severe visual disturbance, stiff neck, repeated vomiting, high fever, or difficulty breathing. Arrange same-day review if pain is severe and does not settle with rest and fluids, keeps returning, or prevents normal activity.

Could migraine, dehydration, infection, or blood pressure explain this pattern? Which medicines are appropriate in my first trimester? Should I check my blood pressure at home? What symptoms require emergency help?