What should you know about constant headache during pregnancy?

Pregnancy-related changes, tiredness, stress, missed meals, dehydration, nasal congestion, or reducing caffeine can contribute to headache. A cold or sinus problem may cause pressure around the face; see [Allergic Rhinitis](/conditions/allergic-rhinitis/) for one possible source of nasal symptoms. A persistent headache can also accompany high blood pressure or pre-eclampsia, particularly later in pregnancy. The headache itself cannot determine the cause, so a blood-pressure check and clinical assessment may be needed.

Contact your maternity team or doctor for advice rather than self-treating repeatedly. Rest, eat regular small meals, drink fluids, and reduce bright light or screen strain. Keep a record of timing, location, severity, blood-pressure readings if available, and associated symptoms. Check every medicine, supplement, or herbal product with a qualified clinician before taking it during pregnancy.

Seek urgent maternity or emergency care for a severe or sudden headache, vision changes, flashing lights, pain below the ribs, new swelling of the face or hands, shortness of breath, confusion, weakness, seizure, fever with a stiff neck, or repeated vomiting. Also seek prompt advice if the headache does not improve with rest and fluids or feels different from headaches you have had before.

Ask how often your blood pressure should be checked, which pain-relief options are suitable, and whether urine or blood tests are needed. Tell the clinician about your pregnancy stage, previous headaches, medicines, vision symptoms, swelling, and any recent illness. Ask which symptoms should send you directly to the maternity unit.