Blackouts are scary enough on their own, but when they happen while someone is driving they’re also incredibly dangerous. While it’s sometimes difficult to know what causes blackouts while driving, these are some of the most common causes:
*Fainting—responsible for more than 50% of blackouts and can be caused by anything from overheating to stress.
*Syncope—refers to temporary loss of blood flow to the brain, due to cardiovascular disease or arrhythmias
*Drug use or intoxication
*Hypoglycemia—low blood sugar
While it’s likely your friend just suffered a fainting spell, it’s important she sees a doctor as soon as possible to rule out any possible underlying medical causes for her fainting spell.
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MORE: What happens if you have a seizure while driving?