Increased immunity, radiation, pollution, diet, genetics, and some other aspects can cause an increase in red blood cell hemoglobin concentration.
Usually waking up in the morning without water or usually drinking less water will lead to an increase in the hemoglobin level, and the corresponding average hemoglobin level will be high, and you should pay more attention to drinking water and regulating your diet in your daily life without causing any harm to your body.
Some chronic heart disease, pulmonary heart disease, cyanotic congenital heart disease, etc., have a compensatory increase in the amount of red blood cells and hemoglobin in the blood because of tissue hypoxia and increased erythropoietin in the blood.
There are also tumors, such as kidney cancer, hepatocellular carcinoma, and uterine fibroids, which can also contribute to a non-compensatory increase in erythropoietin, resulting in a high average hemoglobin concentration in red blood cells.
True erythropoiesis, a blood disorder of unknown cause that is predominantly erythropoietic, can also cause high mean erythrocyte hemoglobin concentrations.
In addition, some severe congenital and acquired cardiopulmonary diseases and vascular malformations, such as obstructive emphysema, can also contribute to a compensatory increase in erythropoietin.