A 20-year-old boy with systolic blood pressure of 140 mmHg is classified as Grade 1 hypertension, and antihypertensive drugs are not recommended for the time being. The cause of the hypertension needs to be identified, such as whether it is transient hypertension or secondary hypertension. A single measurement of elevated blood pressure can not be used as a basis for determining hypertension. Emotional excitement, running, exercise, and anger can all cause a transient increase in blood pressure. The diagnostic criteria for hypertension in different states are also different, mainly based on the blood pressure value measured in the clinic, which usually requires 2~3 measurements of blood pressure within 1~4 weeks, and the clinic blood pressure ≥140/90mmHg can be diagnosed as hypertension. In addition, the 20-year-old boy systolic blood pressure 140mmHg, but also need to consider whether the secondary hypertension, to go to the hospital by the doctor a comprehensive examination, to exclude can cause high blood pressure disease before considering whether to take antihypertensive drugs. The 20-year-old boy systolic blood pressure 140mmHg, can first take lifestyle intervention, such as regulating emotions, relaxation, pay attention to rest, light diet, quit smoking, quit drinking. If you still can’t lower your blood pressure by changing your lifestyle, you can take antihypertensive drugs to improve your blood pressure under the guidance of your doctor.