True or false: blood will boil at 50,000 ft altitude

i am watching this documentary on national geographic and the guy is taking about a mission on an aircraft and that they have pressure suits he said "above 50,000 ft your blood boils without the pressurization suits" i wasnt aware blood could boil under any circumstances so is this likely true or false?

True. In a vacuum or near vacuum like 50k feet, water cannot exist as a liquid, it goes immediately to the vapor state, i.e., boils.

However, blood inside the body is not immediately exposed to a vacuum, that keeps it from boiling for minutes at least.

true
i knew a friend of my moms that died because her blood boiled when she was laying out sunbathing shortly after she had
chemotherapy. true story.

That sounds about right.

If you are exposed to low pressures like that, a lot of nasty things happen.

True