a varitaion of blood pressure from 8 to 10mm of hg is absolutely a normal phenomenon normal bp is less then 120/80 pre hypertensive stage is from 120 to 139/80 to 89 grade 1 (mild hyprrtension ) is from 140 to 159/90-99 grade 2 (moderate hypertension) is from 160to 179 /100to 109 grade 3( severe hypertension) is from 180 and above /110and above so basically this is the categorisation a variation of blood pressure by few digits vary from physical status of body enviroment and many other factors! at a age of 27 you are in grade 1 hypertension you should start 45min strenous exrecise every day ,follow strict life style modification and take tab amlodipine 5mg once a day for 3months monitor your bp every 7th day and maintain a dairy!!