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Symptom Checker

Step 4: Read and complete the decision guide to learn more about your symptoms.

Blacking Out, Fainting, or Loss of Consciousness

It may be that you had a drop in your blood pressure. If blood pressure falls too much too quickly, it can cause you to black out.

Call your doctor for advice.

Your doctor will consider whether this could be:

- Low blood sugar

- Dehydration

- Heart related problem

- A seizure

- Alcohol or drug effect

Continue with this guide after making the call.

Click here to continue with the guide.

Disclaimer: This content should not be considered complete and should not be used in place of a call or visit to a health professional. Use of this content is subject to specific Terms of Use & Medical Disclaimers.

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