Yes, very dangerous... Low bp is called hypotension.

Hypotension usually means blood pressure that is lower than 90/60 mmhg (millimeters of mercury) or is low enough to cause symptoms. When the blood pressure is too low there is inadequate blood flow to the brain and other vital organs, light-headedness or fainting may occur.

A common type of hypotension is postural (also known as orthostatic) hypotension, in which suddenly standing leads to light-headedness and fainting.

Can it cause major health problems or kill u. Or is it only dangerous because of the fainting?

Fainting can kill you. What happens if you were swimming or at the beach and you blacked out? How about while driving?

I've been told I have hypotension by an experienced first aider. He checked my bp once, and told me I was about 95/55.. And last time I checked.. It was 89/52... I experience heart thumping very slow.. My general pulse is 72/minute.. Is that normal? I also suffer from low blood sugar (hypoglycemia).. I have to eat small frequent meals.. Otherwise I might faint..

But how do I tell if I have low bp or hypoglycemia.. The symptoms are so alike.. When I stand up I feel lightheaded... What do I do..

Any help? Please. And thankyou.