Internal bleeding (hemorrhage) can be caused by condition called -

Thrombocytopenia is a condition characterized by an abnormally low number of platelets (thrombocytes) in the blood.

Platelets are essential for blood clotting (coagulation). A significant decrease in the number of platelets can lead to clotting disorders, which may result in excessive blood loss or internal bleeding (hemorrhage).

Polycythemia is an abnormal increase in red blood cells.

Erythropoiesis is the process of formation of red blood cells.

Leucopenia is a decrease in the number of white blood cells.

Answer: thrombocytopenia