(someone) feels lightheaded

When you feel "lightheaded", you feel dizzy, like you might faint. Your vision might turn dark for a moment.

The difference between "lightheadedness" and "dizziness" is that we call a more long-lasting feeling of being off balance "feeling dizzy". Lightheadedness usually just lasts for a moment. You might "feel lightheaded" if you stand up too fast, or after exercising too hard.

This phrase appears in these lessons: