Hypertension usually has no obvious spontaneous symptoms and can cause corresponding symptoms if it involves the heart, brain, kidneys, fundus and other vital organs. For most patients, hypertension usually has no conscious symptoms. Many patients are not even aware that their blood pressure is high and only discover it during a physical examination or occasional blood pressure measurement. Many patients do not know they have high blood pressure until they have a heart attack, stroke, or kidney failure and need dialysis. Therefore, hypertension is called the “silent killer”. Hypertension can cause damage and clinical complications to the heart, brain, kidneys, systemic blood vessels, fundus and other important organs, which are called the target organs of hypertension, and once complications occur, they can be life-threatening and affect the quality of life. Therefore, it is recommended that adults with normal blood pressure should have their blood pressure measured at least once every two years, and those prone to hypertension should have their blood pressure measured at least once every six months. The system of measuring blood pressure at the first visit to medical institutions at all levels should be strengthened to facilitate early detection and treatment. Symptoms such as dizziness, headache, blurred vision, tinnitus, insomnia, palpitations, shortness of breath, chest tightness, obesity, sleep snoring, weakness, memory loss, limb weakness or paralysis, increased nocturia, and foamy urine suggest possible high blood pressure and the need to see a doctor as soon as possible.