Secondary hypertension is mostly related to renal parenchyma, renal blood vessels and adrenal glands, and related diseases include acute glomerulonephritis, renal artery stenosis and aldosteronism. 1. Acute glomerulonephritis: it develops in the glomerulus, often with precursor symptoms such as upper respiratory tract infection, with hematuria as the main manifestation, accompanied by transient hypertension, renal function abnormality and edema and other clinical manifestations. 2. Renal artery stenosis: the onset of one or both renal arteries, stenosis can cause hypertension, renal insufficiency and other clinical manifestations. 3. Aldosteronism: it develops in the adrenal cortex, when the adrenal cortex forms tumors or hyperplasia, it will lead to increased secretion of aldosterone, and the role of aldosterone is to preserve sodium and excrete potassium, so in the clinic, the patients mostly take hypertension and hypokalemia as the main manifestations. If secondary hypertension is considered in daily life, it is recommended to go to regular hospitals for consultation and treatment according to the doctor’s prescription to avoid delaying the condition.