Symptom Checker
Step 4: Read and complete the decision guide to learn more about your symptoms.
Blacking Out, Fainting, or Loss of Consciousness
In this situation, it is often difficult to know if you actually blacked out or just fell asleep.
If you are unsure, call your doctor for advice.
If you still feel lightheaded when you wake up, your blood pressure may be too low for you.
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