In an emergency hypertensive crisis, your blood pressure is extremely high and has caused damage to your organs?
Yeah it can damage some organs, but really its also a big problem if you have weak/damaged arteries somewhere that are weak enough they could rupture. High pressure for a long time is hard on the arteries. Kinda like tires. Weak sidewalls, thin tread, weak spots. Now overfill your tire pressure by 10-20%. And then drive crazy like a normal urban nutjob going to work.