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9 Reasons Why You Feel Lightheaded—And When To Be Concerned

Prevention Logo By Sarah Klein of Prevention | Slide 1 of 9: <p>Some people are simply predisposed to feeling lightheaded or even fainting when they get hot and sweaty and lose too much fluid. "It's common in a hot room, like standing in church in the summer," Thiruganasambandamoorthy says. "Heat triggers a pathway in the nervous system that causes blood pressure to drop." When you feel lightheaded because of <a href="http://www.prevention.com/health/dehydration-and-your-body">dehydration</a> and heat, lying down resupplies the heart and the brain with blood and you can feel better pretty quickly, he says. (Here's <a href="http://www.prevention.com/health/4-ways-to-tell-if-youre-dangerously-dehydrated">how to tell if you're dangerously dehydrated</a>.)</p><p>Rehydrate with this easy sassy water recipe:</p>

You're dehydrated.

Some people are simply predisposed to feeling lightheaded or even fainting when they get hot and sweaty and lose too much fluid. "It's common in a hot room, like standing in church in the summer," Thiruganasambandamoorthy says. "Heat triggers a pathway in the nervous system that causes blood pressure to drop." When you feel lightheaded because of dehydration and heat, lying down resupplies the heart and the brain with blood and you can feel better pretty quickly, he says. (Here's how to tell if you're dangerously dehydrated.)

Rehydrate with this easy sassy water recipe:

© Photograph by Maridav/Shutterstock

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