May Be Caused by

 Common

Primary hemolytic anemia

Thalassemia

 Uncommon

Aplastic anemia

Benzene intoxication

Bone marrow injury

Carcinomatosis

Cyanotic congenital heart disease

Erythroblastosis fetalis

Erythroleukemia

Iron deficiency anemia

Leukemia

Lymphoma

Myelofibrosis

Paget disease of bone

Pernicious anemia

Polycythemia vera

Radiation

Thrombocytopenic purpura

Thrombocytosis