In some cultures in the Northern Hemisphere, the astronomical March equinox (varying between 19 and 21 March) is taken to mark the first day of spring, and the Northern solstice (around 21 June) is taken as the first day of summer. In other traditions, the equinox is taken as mid-spring.
Circulation problems that cause dizziness. You may feel dizzy, faint or off balance if your heart isn't pumping enough blood to your brain. Causes include: 1  Drop in blood pressure.
Since youâre holding air in your lung cavity, you end up compromising your blood flow. As a result, less blood travels to your heart and to your brain, leading to a drop in blood pressure. This can cause you to become dizzy and to actually faint. Related: Why You Feel Dizzy When You Stand Up.