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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

Assuming that you are not taking any medications that slow down your heart rate, this indicates an abnormal response to standing. If your blood pressure falls, normally your heart tries to pump out more blood by beating faster.

There may be a problem with your autonomic nervous system. This can occur in people with diabetes, some genetic disorders, and some rare diseases.

Call your doctor's office for advice and to arrange an appointment.


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