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Anemia is caused by a lack of healthy red blood cells. As for what it takes to become anemic the list could go on and on. Basically anything that causes destruction of red blood cells can cause anemia, but destruction is not the only cause. It may also be caused by a lack of production of healthy red blood cells or if the destruction rate of the healthy cells is faster than your body can make them.

As for causes the only ones that I know of (I'm sure someone can give you more) are vitamin deficiencies, excessive bleeding, and some types of auto immune diseases (where the immune system attacks the red blood cells). I am sure there are many other causes, but from my understanding these are the most common. :)

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14y ago

What else can I help you with?