1. Blood loss, which may be present including stomach bleeding or rolled hemorrhoids anal. If bleeding out to cause anemia. And there may be hypotension, but bleeding and chronic out gradually, such as hemorrhoids. Period a lot. A worm in the intestines, blood pressure levels are usually normal. But there will be symptoms of anemia, such as fatigue, fatigue, heart attack.2. Blood diseases such as Thalassemia G6PD.3. May cause edema (fluid conditions retention) cause dilution, such as cirrhosis, renal failure, and anemia, red blood cells, too low.4. May be caused by kidney that send hormones to bone marrow for erythropoiesis is too low.5. Iron deficiency, lack of folic acid and vitamin B12.
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