The Head Rush When You Stand Up Fast
Noah sat on the floor for a long time, building with blocks. When he jumped up to get a snack, the room seemed to wobble. Tiny sparkles floated in front of his eyes. What was going on?
Blood travels all around your body, and your brain needs a steady supply. When you sit or lie down, your blood spreads out evenly. When you stand, gravity pulls some of it down toward your legs.
Usually your body adjusts in a blink. Your blood vessels squeeze a little, and your heart pumps a bit faster. That pushes the blood back up to your head. But if you stand up very quickly, the body may lag behind for a moment. For a second or two, less blood reaches your brain. That is what causes the wobbly, sparkly feeling.
It goes away fast. You can help by standing up slowly and pausing before you walk. Drinking enough water helps as well. If dizziness happens a lot or lasts, tell a grown-up.