A hypertensive crisis is basically of two types- hypertensive urgency and hypertensive emergency. Both the conditions require immediate medical attention to evaluate the threat of organ damage and chalk out an appropriate plan of action.
Hypertensive urgent: If your blood pressure is 180/120 or above but you are not experiencing any associated symptoms like chest pain, shortness of breath, back pain, numbness/weakness, changes in vision, or difficulty speaking then it would be considered as a hypertensive urgent case. Wait for 5 minutes and take another reading. In urgent cases doctors normally change the medication to bring the blood pressure level down.
Hypertensive emergency: If your blood pressure reading is 180/120 or greater and along with that you are experiencing symptoms like chest pain, shortness of breath, back pain, numbness/weakness, change in vision, or difficulty speaking then it would be considered a hypertensive emergency. Do not waste any minute in such a case and immediately rush to the emergency.