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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.
Pregnancy and Headaches. Headaches During Pregnancy: Causes and Treatment. Headaches are one of the most common discomforts experienced during pregnancy. Headaches may occur at any time during your pregnancy, but they tend to be most common during the first and third trimesters. During the first trimester, your body experiences a surge of hormones and an increase in blood volume.