Usually, patients can determine primary hypertension and secondary hypertension through etiologic history, accompanying conditions, and examination. 1. Etiologic history: The etiology of primary hypertension is still unclear, and may be related to heredity and bad habits. Secondary hypertension, on the other hand, has a clear cause and is usually a concomitant symptom of other diseases such as nephritis, renal artery stenosis and Cushing’s syndrome. 2. Accompanying conditions: primary hypertension usually has no obvious accompanying symptoms. Secondary hypertension may be accompanied by hypokalemia, tachycardia, sweating, headache, pallor and decreased renal function. 3. Examination: Usually, ultrasound of adrenal glands, renal parenchyma and blood vessels, radionuclide and other tests can clarify the nature and location of lesions in secondary hypertension. Regardless of whether it is primary hypertension or secondary hypertension, patients should actively seek medical attention and under the guidance of doctors for standardized treatment.