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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.
Studies have demonstrated that the weeks following childbirth, known as the puerperium, are a particularly vulnerable time period for development of headaches of a variety of primary and secondary headache disorders, mainly due to hormonal, physiological, procedural, and psychological factors (1).