It is not easy for someone to realize that he/she is affected by high blood pressure, since it does not cause any symptoms. When there are medical reasons, or when an individual wishes to check his/her pressure as a precaution, the only method for diagnosing high blood pressure, and possibly hypertension, is the daily measurement of the blood pressure, using reliable meters. The levels of pressure values constantly change during the day; to this end, in order to specify the level of the pressure, numerous measurements are required at different times of the day (morning and afternoon) under resting conditions. Measurements under unsuitable conditions, e.g. irritation, pain, panic, etc. could be misleading, and thus they do not represent the “actual pressure”. In most cases, it is necessary to repeat the measurement after a short period, while preserving resting conditions. However, if high pressure is accompanied by another serious problem, then it must be immediately dealt with and monitored by a physician. Only after regularly checking blood pressure one may verify whether or not he/she has hypertension.