Red blood cell distribution width is high, what's going on?

Red blood cell distribution width is high, may be caused by anemia, may also be suffering from cardiovascular disease, such as acute myocardial infarction. Secondly, when suffering from stroke, or some respiratory diseases, there will also be increased phenomenon. In addition, type 2 diabetes with coronary heart disease or kidney disease, there will also be red blood cell distribution width is high phenomenon.