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.

What does dizziness from dehydration feel like?

One of the potential symptoms of dehydration is dizziness. You may feel lightheaded or woozy. In some cases, you may also feel as if you or your surroundings are spinning or tilting. This is known as vertigo.

Does drinking water help with dizziness?

Dizziness can be treated with medication. Dizziness is sometimes caused by dehydration. Drinking water can help alleviate it in many cases. Dizziness can often get better without treatment.