A condition in which a person's blood does not have enough red corpuscles; the severity of which is usually determined by how much the red blood cells have been decreased because when there is inadequate hemoglobin (iron-containing pigments of the red blood cells), all parts of the body receive less oxygen and have less energy than is normally needed to function properly: The results of the blood work done by Dr. Nelson indicated that Lora was suffering from anemia.

The degree of anemia in Percy alarmed the doctor and so she prescribed medications.

Many people who are suffering from various degrees of anemia are often pale, lifeless, and lacking in energy or vitality.

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A severe disorder of blood, found mostly in older adults, that results from the body's inability to absorb vitamin B12 which is essential for normal red blood cell production in the bone marrow: Symptoms of pernicious anemia include weakness, breathing difficulties, and weight loss and those who have the illness do not produce the substance called "intrinsic factor" in the stomach, which allows the body to absorb the vitamin which is also essential for normal nerve cell development.