I may be wrong, but I beliebce the answer is lack of iron.
Explanation:
Blood cancer is one type of cancer commonly linked to anemia. That's because blood cancer affects how your body produces and uses red blood cells. Most of the time, blood cancers start in the bone marrow and cause abnormal blood cells to start growing.
Becausee
Having low calcium is rare in people with cancer. It can be a temporary side effect of some cancer treatment drugs, such as cisplatin and doxorubicin. The main cause of low calcium levels is having the parathyroid glands in your neck removed. This might be necessary for some types of cancer in the neck area.
