What is the condition characterized by over production of erythrocytes is called?

The condition characterized by the overproduction of erythrocytes (red blood cells) is called polycythemia. It can be classified into primary polycythemia, which is often due to a genetic mutation (such as in polycythemia vera), and secondary polycythemia, which results from increased erythropoietin levels due to factors like chronic hypoxia or tumors. This condition can lead to increased blood viscosity and a higher risk of thrombotic events.