According to the National Heart, Lung, and Blood Institute (NHLBI), there are four main types of anemia: Iron-deficiency anemia is the most common form of anemia, according to the American Society of Hematology (ASH) (
https://www.hematology.org/education/patients/anemia). It occurs when someone does not produce enough iron — and, therefore, not enough red blood cells (RBCs) — due to a poor diet [...]