Moderate hypertension is defined as a systolic blood pressure of 160 to 179 mm Hg and/or a diastolic blood pressure of 100 to 109 mm Hg without antihypertensive medication. Its untreated and may cause heart, brain, kidney and other organ disease. So its important. 1. Heart: long-term high blood pressure, long-term pressure load increase, will cause left ventricular hypertrophy and dilatation, resulting in hypertensive heart disease, often combined with coronary atherosclerosis and microvascular lesions. 2. Brain: long-term high blood pressure can lead to ischemia and degeneration of cerebral blood vessels, forming micro-aneurysms, and cerebral hemorrhage can occur. Hypertension will also make cerebral artery atherosclerosis, easy to complicate cerebral thrombosis. It can also form lacunar cerebral infarction and so on. 3. Kidney: long-term hypertension can lead to increased pressure in the glomerular capsule, glomerular atrophy and fibrosis, resulting in renal parenchyma ischemia and reduction of renal units. When patients suffer from moderate hypertension, they should pay attention to it and go to the hospital for treatment as soon as possible.