Find out from WebMD's slideshow how dehydration, low blood pressure, arrhythmia, and other problems can make you feel woozy and even faint.
Dehydration. You may become dehydrated if you're overheated, if you aren't eating or drinking enough, or if you're sick. Without enough fluids, the volume of your blood goes down, lowering your blood pressure and keeping your brain from getting enough blood, causing lightheadedness. How do...
Lie down immediately or hold your head between your legs Close your eyes until you feel better Be careful while moving and getting up from bed; get up slowly Avoid risky things such as driving, ladder climbing, using heavy machinery, or lifting weights Take adequate rest Avoid rapid movements ...