Hi, you have 10 questions at once. I ll try to help you in these questions quite objectively. To rule out hypertension you must use the proper technique for blood pressure measurement requires rest for at least 10 to 15 minutes just to reduce the effects of epinephrine. Thus, when you measure your blood pressure outside the doctor s office, follow the routine of sitting and relax for at least 15 minutes before checking, furthermore, make two or three measures following with 5 minute intervals between such measurements. Furthermore, it is necessary to use a cuff of width suitable for yours arm cirunferência. There are several easy to obtain tables showing these parameters. Considered ideal blood pressure levels are below 120 mmHg (millimeters of mercury) for systolic pressure and 80 mmHg for diastolic blood pressure. Levels above these values should be investigated. Hypertension can affect people at any age, including children, but it is very common in adults over 30 years. Factors that may cause hypertension obstructive sleep apnea, obesity, family history of hypertension in first-degree relatives, the presence of kidney disease ... High blood pressure causes serious diseases such as myocardial infarction, as stroke, as severe renal impairment, as blindness, as heart failure ... The diet with low salt levels can help control blood pressure levels, as well as weight loss and control of obstructive sleep apnea. Hope I have answered all of your questions. If you have any further questions I will be happy to help you. Wish you good health.