What Causes Headaches During Pregnancy (Third Trimester)? Topic Guide

What Causes Headaches During Pregnancy (Third Trimester)? What Causes Headaches During Pregnancy (Third Trimester)?: Headaches in the second or third trimester could be due to preeclampsia, a serious pregnancy complication that causes high blood pressure (hypertension) and organ injury. Other causes may include stress, sinus congestion, eye strain, fatigue/lack of sleep, allergies, dehydration, hunger, poor diet, excess weight, high blood sugar (hyperglycemia)/diabetes, depression, caffeine withdrawal, and more.

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