Step 4: Read and complete the decision guide to learn more about your symptoms.
Blacking Out, Fainting, or Loss of Consciousness
If you get lightheaded now as you stand, it is likely that you need more fluid, and possibly a little extra salt. Since you don't know your blood pressure, we need to make an assumption that your blood pressure did fall a little. Increase your fluid intake. If your symptoms persist, call your doctor for advice.
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