Blood pressure 139/86mmHg is usually considered within the normal blood pressure range. Blood pressure 139/86mmHg refers to a systolic blood pressure of 139mmHg and a diastolic blood pressure of 86mmHg. Blood pressure is usually defined as the pressure of blood within a blood vessel against the wall of the vessel. Normally normal adult blood pressure ranges between 89 and 139 mmHg systolic and 60 to 89 mmHg diastolic. The pressure on the vessel walls is highest when the heart is contracting, when systolic blood pressure is produced. When the heart is in diastole, the pressure on the blood vessel wall is the lowest, which produces diastolic blood pressure. Normally, you should develop a good lifestyle and dietary habits, avoid staying up late and overworking, eat less spicy and stimulating food, eat more fresh fruits and vegetables, take proper exercise, avoid smoking and drinking. If high blood pressure occurs, you should go to the hospital for medical treatment.