Iron helps your body get oxygen through the bloodstream. Without iron, fewer red blood cells can be made, which causes anemia. Iron levels can get too low because of bleeding, due to heavy menstruation or other problems, such as ulcers. It can also be caused by simply not getting enough iron through your diet. Common symptoms of an iron deficiency include fatigue, dizziness, and moodiness, along with other symptoms. Treatments include taking iron supplements. Follow the links below to find WebMD's comprehensive coverage about how iron deficiency is caused, how to treat it, and much more.