Is passing out due to high or low blood pressure?

Thanks for asking!: Could be due to low pressure... But also due to cardiac arrhythmias, hypoglycemia, seizures, etc.., etc...

Syncope/Collapse: Clinical terms for passing out. More common reason related to blood pressure would be low blood pressure though in rare situations, very high blood pressure might cause someone to lose consciousness. The preceding symptoms would likely be different. Typical low blood pressure, if systems working: faint lightheaded feeling, rapid heart rate, and sweating are common.