What causes high hemoglobin?
High hemoglobin could mean any one of many things. Decreased heart, lung function, or kidney function. Kidneys making too much erythropoietin. Some drugs stimulate production. Bone marrow dysfunction. High altitude. Smoking And some more rarer causes From the single symptom of high hemoglobin, I can't determine what the specific cause is.
It could mean your RBC count is high, and your blood is thick........You need plasma. You may have a disorder that causes your plasma to be low or that causes your RBC count to be high. It also could mean, If you are an endurance athlete, that you are "blood doping" with hemopoitin in order to augment your oxygen carrying capacity.