When your blood sugar level becomes low, because you've gone too long without eating or when your blood suddenly shifts, causing your blood pressure to drop rapidly, you may experience some light headedness or dizziness and feel like fainting. Another common cause in the last half of pregnancy can be the extra pressure of your uterus on blood vessels and arteries. Make sure you don't go for long periods of time without eating. Take snacks (especially those high in protein and iron) with you when you go places. Always remember to change positions and stand up slowly after sitting or lying down to avoid feeling dizzy and don't stand for extended periods of time.
