Blood cell count
Chemotherapy can affect the production of blood cells: white blood cells, red blood cells, and platelets.
Therefore, it is natural that the numbers of these cells in the blood fall between treatments.
However, if this reduction is too significant, you are in danger of infections, anemia, or bleeding.
In that case, your doctor may need to adjust your dose or stop the treatment for a while, so that you can recover.
Although this does not happen every time, it is a relatively common situation in chemotherapy treatments.
If you develop any signs of infection, you might need antibiotics, while severe anemia might require a blood transfusion.