High erythrocytes are caused by erythropoiesis, which is usually clinically divided into relative and absolute increase in erythrocytes. Some physiological factors can cause absolute increase in erythrocytes, such as compensatory increase in erythropoietin in fetuses, newborns and residents of highland areas, which is a normal phenomenon; the situation caused by disease factors is relatively serious, and its severity is closely related to the etiology of the original disease and the degree of the disease, among other factors. I. Relative increase in erythropoietin occurs when individuals with violent vomiting, severe diarrhea, extensive burns, uremia, diabetic ketoacidosis, hyperthyroidism, etc., have a relative increase in erythropoietin due to excessive water loss resulting in blood concentration. These people usually need timely rehydration treatment, appropriate increase in water intake and active treatment of the primary disease. The relative increase in red blood cells is easier to correct, and the severity depends on the impact of the original disease, which varies greatly from one disease to another. This is also known as absolute erythrocyte increase, there are secondary and primary. 1, secondary erythrocyte increase: such as chronic obstructive pulmonary emphysema, pulmonary heart disease, congenital cyanotic heart disease, etc., resulting in long-term hypoxia, causing a secondary increase in red blood cells. This type of situation can be improved by treatment, but because most of the primary causes are more serious, active treatment is needed, regular medication or hospitalization under the guidance of a doctor; 2, primary increase in red blood cells: generally refers to true erythrocytosis, which is a myeloproliferative tumor with an increase in the number of red blood cells, due to abnormal bone marrow proliferation, which can appear as an increase in red blood cells. This kind of erythrocyte increase is also more serious, which can cause dizziness, tinnitus and other abnormal manifestations of the nervous system, as well as red and purple skin, mucous membrane congestion and other manifestations, and more timely prevention and control of thrombosis, otherwise it may cause thromboembolism in the limbs, intestinal tract and brain, causing serious consequences, once diagnosed, to strictly comply with the doctor’s treatment.