Symptomatic hypertension, which is hypertension that accompanies the development of certain diseases, is also known as secondary hypertension. Symptomatic hypertension accounts for about 10% of all hypertension. Unlike hypertension (primary hypertension), symptomatic hypertension has a cause that can be traced, and its treatment and prognosis are very different from hypertension, and in some cases it is completely curable. Symptomatic hypertension is characterized by: 1. young age of onset; 2. rapid progression of hypertension; 3. sudden aggravation of existing hypertension; 4. poor efficacy with application of usual antihypertensive drugs; 5. paroxysmal or persistent muscle weakness or even flaccid symptoms; 6. polyuria, especially nocturia.