Step 4: Read and complete the decision guide to learn more about your symptoms.
Blacking Out, Fainting, or Loss of Consciousness
If you have had a recent illness, such as a bad cold or the flu, you could have easily gotten behind in your fluid intake. This is especially true if you had nausea, vomiting, or diarrhea. The lightheadedness may occur even a couple days after the other symptoms have resolved.
Have you had a recent illness that might be a factor?