Girls ??‍♀️were admitted to the hospital with high blood pressure, the…

Girls ??‍♀️were admitted to the hospital with high blood pressure, they said if it stays that way they'll call for labor, now I'm worried... what is dangerous about high blood pressure? Everywhere they just say "high blood pressure is dangerous and so on" but they don't say what could happen or the consequences? Ugh, I'm worried... I felt normal, blood pressure was 130/90, now in the hospital it's rising to 140 and maybe more.