Hemoglobin is a very important item in routine blood tests, low hemoglobin may lead to anemia in patients, but some people find themselves with high hemoglobin, but do not know what this means, what are the causes of high hemoglobin? The normal reference range of hemoglobin: adult male: 120-160g/L; adult female: 110-150g/L; newborn: 170-200g/L; adolescent (children): 110-160g/L. There are two causes of low hemoglobin: physiological causes and pathological causes. Physiological causes of high hemoglobin: 1. Some residents who live on the plateau (the lack of oxygen on the plateau causes the phenomenon of high hemoglobin due to tissue hypoxia). 2, newborn babies generally have the phenomenon of high hemoglobin (newborns need to adapt to the new external environment and need to go through 2 to 3 weeks of physiological regulation, when special physiological states, such as jaundice, appear). 3.Emotions during excitement can easily lead to transient high hemoglobin. 4, blood concentration, so that the relative increase in the content of red blood cells and hemoglobin, will cause high hemoglobin. For example, strenuous exercise, extensive burns, severe diarrhea, and profuse sweating. Pathological causes of high hemoglobin: 1. Some patients with congenital heart and lung diseases can cause high hemoglobin (such as tetralogy of Fallot, cyanotic congenital heart disease, obstructive emphysema, pulmonary heart disease), because the compensatory increase of erythropoietin in the body causes high hemoglobin. 2.Some tumor diseases can lead to high hemoglobin (such as kidney cancer, hepatocellular carcinoma, uterine fibroid, ovarian cancer, renal embryonal carcinoma, etc.), and the non-compensatory increase of erythropoietin leads to the above-mentioned results. 3.True erythropoietic disease leads to high hemoglobin, which is a blood disorder of unknown cause mainly due to increased red blood cells. 4. Uroplasia, hyperthyroid crisis, diabetic acidosis, etc., can lead to high hemoglobin. As can be seen, no matter which aspect causes the elevated hemoglobin value in the body, it will have a certain impact on the patient’s health, therefore, it is important to pay attention to their health conditions in daily life and make good adjustments. Therefore, when there is the phenomenon of elevated hemoglobin, it is important to understand the following precautions: 1, you should pay attention to adjusting the diet structure, it is best not to eat animal liver, scaleless fish and fatty meat, less peanuts, melon seeds and other nuts containing a lot of oil, eat more fresh vegetables and fruits, do more outdoor exercise, etc. 2, pathological causes of hemoglobin, be sure to go to the hospital in time to check the cause, the right treatment to the disease. 3, every morning on an empty stomach a glass of warm light salt water, which helps to dilute the blood.