Thanks for your question.
Basically the amount of ferritin in the body is directly proportional to the total iron stores in the body, therefore serum ferritin concentrations is used as a common diagnostic tool in the evaluation of iron status. Decreased ferritin level indicates iron deficiency, leading to anemia. So we need to investigate the cause for the iron deficiency which can be nutritional deficiency or may also be due to blood loss.
No, nutritional iron deficiency is the common cause. Bleeding is also a one of the causes which can be due to malignancy, but can also be due to an ulcer or post menopausal bleeding.
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Yes they may. But not always.