<unk>  is a bone marrow disease that leads to an abnormal increase in the number of blood cells. The red blood cells are mostly affected.
Polycythemia vera
Aplastic anemia
Essential thrombocytosis
Myelofibrosis
Chronic myelogenous leukemia
Idiopathic thrombocytopenic purpura
Transient erythroblastopenia of childhood
Thrombotic thrombocytopenic purpura