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There are four key causes of low creatinine: low muscle mass; liver problems; diet; pregnancy or illness; Low muscle mass. Levels of creatinine are often linked with muscle mass or the amount of muscle in the body, which can decrease with age or illness.
Causes of a low ferritin level include chronic bleeding in the digestive tract, heavy menstrual bleeding, iron-deficiency anemia and problems absorbing iron, explains MedlinePlus. Ferritin is a protein that stores iron in the body.