If an increase in blood pressure is detected, then it is necessary to conduct further tests to clarify whether it is primary hypertension, or hypertensive disease; or secondary hypertension. Hypertension is a disease whose cause is not well defined and whose main clinical manifestation is a persistent increase in blood pressure. Secondary hypertension, on the other hand, is a symptom of certain diseases (such as nephritis, renal artery stenosis, adrenal adenoma, etc.) and is therefore also called symptomatic hypertension. Patients should visit a specialist when they go to the hospital, and when speaking to the doctor about their condition, they should not limit themselves to the symptoms you think are related to hypertension, but should give a full account of their physical condition and recall the schedule of onset of these symptoms as much as possible. Based on the history, physical examination and routine laboratory findings, the following further tests should be selected if secondary hypertension or target organ damage is suspected: adrenal CT, renal artery ultrasound, blood and urine catecholamines, etc. If left ventricular hypertrophy or other cardiovascular disease is clinically suspected, cardiac ultrasound should be done. Having this information will help in treatment decisions. Similarly, vascular ultrasound should be performed if aortic, carotid and peripheral artery disease is suspected. Routine laboratory tests include urine routine, blood sodium, blood potassium; blood urea nitrogen, creatinine, fasting glucose; lipid analysis, electrocardiogram, etc.