Headache in pregnancy is due to Pregnancy Hormones which increase resulting in dilatation of vessels thus pooling blood into them and lowering mother’s blood pressure; also blood glucose level is lowered. Other factors that contribute to dizziness are lying on your back in the third trimester or severe pregnancy induced anemia. Headache in pregnancy is caused by hormonal changes, blood expansion or lack of sleep. Eat well and rest well.
Scientific Update (October 2026)
This chapter was first published in 2018 as part of the Prenatal Care Book, and has been reviewed and updated according to the latest guidelines. Key updates:
- Severe headache after 20 weeks, especially with blurred vision, facial swelling or pain under the ribs, may be a sign of pre-eclampsia and needs immediate blood pressure and urine checks.
- Paracetamol is the safe painkiller; avoid painkiller doses of aspirin and ibuprofen unless prescribed.
References: NICE hypertension in pregnancy (NG133), NICE antenatal care (NG201).
International Guidelines
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