DefinitionDizziness is light-headedness, feeling like you might faint, being unsteady, loss of balance, or vertigo (a feeling that you or the room is spinning or moving).Most causes of dizziness are not serious and either quickly get better on their own or are easily treated.Alternative NamesLight-headedness - dizzy; Loss of balance; VertigoCommon CausesLight-headedness happens when there is not enough blood getting to the brain. This can happen if there is a sudden drop in your blood pressure or you are dehydrated from vomiting, diarrhea, fever, or other causes. Many people, especially as they get older, experience light-headedness if they get up too quickly from a lying or seated position. Light-headedness often accompanies the flu, hypoglycemia, common cold, or Allergies.More serious co