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Common symptoms are due to the reduced amount of oxygen in the body. These include tiredness, having little energy (lethargy), feeling faint, and becoming easily breathless.
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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
Pale skin
Leg cramps
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