The following are causes of high blood pressure:
Smoking
Being overweight
Lack of physical activity
Too much salt in the diet
Too much alcohol consumption (no more than 1 to 2 drinks per day)
Stress
Older age
Genetics
Family history of high blood pressure
Chronic kidney disease
Adrenal and thyroid disorders
Some people even have higher blood pressure when they go to the doctor. It's called "white coat syndrome". People just get nervous being around doctors. You should check it when you aren't in a doctor's office. I can't imagine you would feel well if your pressure is that high, that's dangerously high. Good luck!