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Anemia or anaemia (British English) is a blood disorder in which the blood has a reduced ability to carry Oxygen due to a lower than normal number of RedBloodCells, or a reduction in the amount of Hemoglobin. When anemia comes on slowly, the symptoms are often vague, such as tiredness, weakness, shortness of breath, headaches, and a reduced ability to exercise. When anemia is acute, symptoms may include confusion, feeling like one is going to pass out, loss of consciousness, and increased thirst. Anemia must be significant before a person becomes noticeably pale. Symptoms of anemia depend on how quickly hemoglobin decreases. Additional symptoms may occur depending on the underlying cause. Preoperative anemia can increase the risk of needing a blood transfusion following surgery. Anemia can be temporary or long term and can range from mild to severe. in men is based on a hemoglobin of less than 130 to 140 g/L; in women, it is less than 120 to 130 g/L. [from Wikipedia]
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