It is not normal to get hypertension at the age of 20. If hypertension occurs at the age of 20 it must be checked for the presence of secondary hypertension, most primary hypertension develops in middle and old age and young people generally do not develop hypertension. Once hypertension appears in young people be alert for the presence of pheochromocytoma or aldosteronism, chronic kidney disease, these diseases most often cause hypertension. If these diseases are ruled out, there is also a possibility that the elevated blood pressure is caused by mental stress, staying up late, irregular diet or life, which is relatively easy to improve, as long as the bad habits are corrected, the blood pressure will drop to within the normal range.