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There are more than 400 types of anemia. These types of anemia are divided into three main groups, according to their cause. There is anemia caused by blood loss, by decreased or faulty red blood cell production, and by destruction of red blood cells.
Symptoms common to many types of anemia include the following: Easy fatigue and loss of energy; Unusually rapid heart beat, particularly with exercise; Shortness of breath and headache, particularly with exercise; Difficulty concentrating; Dizziness; Pale skin; Leg cramps; Insomnia; Other symptoms are associated with specific forms of anemia. Anemia Caused by Iron Deficiency