Most high blood pressure in an 18-year-old girl may be secondary hypertension, and a small percentage may be primary hypertension. People younger than 35 years old, found high blood pressure, the first thing to suspect secondary hypertension, including cortisolism, primary aldosteronism, pheochromocytoma, renal artery stenosis, renal failure and so on. It is necessary to improve hypertension 5 items, adrenal CT, renal artery ultrasound, renal function tests. Overweight and obesity, long-term late night, mental stress will lead to high blood pressure, usually to exercise, weight control and weight loss, do not stay up all night, keep a relaxed mood, is conducive to the decline in blood pressure. If the examination did not find problems, in accordance with the treatment of essential hypertension, follow the doctor’s instructions for long-term use of antihypertensive drugs, will lower the blood pressure control at less than 130/80mmHg, to avoid high blood pressure on the body target organ damage.