Untreated blood pressure of 160 mmHg is associated with various complications of hypertension, such as damage to target organs of the heart, brain, kidneys and eyes. 1. A systolic blood pressure of 160 mmHg is classified as second-degree hypertension. If left untreated, long-term hypertension causes left ventricular hypertrophy and cardiac hypertrophy, which can eventually lead to heart failure. 2. Long-term hypertension can form micro-aneurysms of cerebral blood vessels, and cerebral hemorrhage can occur once emotional excitement or excessive fluctuations in blood pressure, so the most common and dangerous complication of hypertension is cerebral hemorrhage. 3. Long-term persistent hypertension increases the pressure of glomerular capsule, glomerular fibrosis, renal arteriosclerosis, and eventually causes renal failure. 4. The small retinal arteries may spasm in the early stage, and atherosclerosis may appear with the progress of the disease. Long-term atherosclerosis of small retinal arteries can cause vision loss, and in severe cases, blindness. Therefore, hypertensive patients should be under the guidance of specialists to carry out regular treatment.