Secondary hypertension in adolescents is roughly the following: 1, aortic constriction: can be ruled out by measuring the blood pressure of the upper and lower worth. Under normal circumstances, the blood pressure of the lower extremity should be 10-20mmHg higher than the upper extremity, if the lower extremity is significantly lower, it should be suspected. CT aortography can be determined; 2, aortitis: the blood pressure of both upper extremities is not the same, one side is significantly higher, while the other side is significantly lower. Measurement of both upper limbs can determine this; 3. Renal artery stenosis: This is the most likely, yet least detectable cause. A narrowing of one side of the renal artery will stimulate a constrictive substance —- angiotensin to increase significantly, thus causing severe hypertension. CT renal arteriography can be done to determine this; 4. Primary aldosteronism: due to adrenal cortical hyperplasia or tumor, resulting in increased secretion of aldosterone autonomously, causing sodium and water retention resulting in increased blood pressure. Patients often have periodic weakness and paresthesia. This is due to concomitant hypokalemia. Blood tests for potassium and preferably a CT of the adrenal glands are required to determine this. 5. Pheochromocytoma: The secretion of the vasoconstrictor catecholamines leads to a severe increase in blood pressure. More than 90% of pheochromocytomas are located in the adrenal glands, so CT of the adrenal glands can be done to rule out the disease; 6. renal failure: blood tests for urea nitrogen and creatinine can be done to rule out renal function; 7. cortisolism: also known as Cushing’s syndrome. Is caused by excessive glucocorticoids in the body, the main clinical centripetal obesity, full moon face, buffalo back. Also can be accompanied by hypertension.