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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.
Such infections may be caused by a bacteria, virus, or fungus, although the cold is the most common contributing factor of sinus infections. Learn more about dealing with a cold during pregnancy. If you have a sinus infection during pregnancy, you may be tempted to take some medication for a quick fix. However, while certain medications are safe to use during pregnancy, other commonly used medications may not be safe to take while pregnant.