Rest for at least 20-30 minutes before taking your blood pressure, and keep your arm at the same level as your heart each time you take a blood pressure measurement, or place your arm on the side of your body if you are in a seated position or in a lying position. In addition, the tightness of the cuff should be appropriate, as a tight or loose cuff will affect the blood pressure value. Patients with hypertension should try to take their blood pressure at the same time of day, such as before breakfast, before going to bed or in the morning, and keep a happy mood when taking the blood pressure, do not be overly nervous, the blood pressure value is more accurate, mood swings, mood is not accurate.