Hematocrit, also known as hematocrit, is the percentage of blood cells in the volume of whole blood. The main hazards of high hematocrit are increased blood pressure and increased heart burden. 1. Increased blood pressure: high hematocrit will lead to increased blood viscosity, which may lead to atherosclerosis, and then increase blood pressure, and in severe cases, may also cause myocardial infarction. 2. Increase the burden on the heart: Elevated blood viscosity will slow down the blood flow, which may lead to insufficient blood and oxygen supply to the heart, thus increasing the burden on the heart and causing dizziness, blurred vision, tinnitus and other manifestations. If you find elevated hematocrit, you should go to the hospital in time to find out the cause of the disease, and under the guidance of a physician to treat the cause of the disease to prevent the occurrence of related complications.