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During the first trimester, your body experiences a surge of hormones and an increase in blood volume. These two changes can cause more frequent headaches. These headaches may be further aggravated by stress, poor posture or changes in your vision. Other causes of headaches during pregnancy may involve one or more of the following: Lack of sleep. Low blood sugar.
Tracking Triggers With a Migraine Diary. Hormone changes during pregnancy are not the only thing that can trigger migraine headaches. Most women have a combination of triggers. For instance, stress, skipped meals, and lack of sleep may all trigger a migraine. And something that triggers a migraine one day may not bother you at all the next.