Our expert says:
Common causes of fainting are low blood pressure, heart arrythmias, nervous system causes or pressure on a blood vessel going to the brain. Some kinds of epilepsy can cause something called "drop attacks", and low adrenal gland function can also cause fainting.
I think you should maybe have an ECG of the heart just to exclude arrythmia, and if this keeps on happening they may need to look further to find the cause.
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