Iron deficiency anemia is the most common form of anemia.
Red blood cells bring oxygen to the body's tissues. Healthy red blood cells are made in your bone marrow. Red blood cells circulate through your body for 3 to 4 months. Parts of your body, such as your spleen, remove old blood cells.
Iron is a key part of red blood cells. Without iron, the blood cannot carry oxygen effectively. Your body normally gets iron through your diet. It also reuses iron from old red blood cells.
Iron deficiency anemia develops when your body's iron stores run low. This can occur because:
- You lose more blood cells and iron than your body can replace
- Your body does not do a good job of absorbing iron
- Your body is able to absorb iron, but you are not eating enough foods that contain iron
- Your body needs more iron than normal (such as if you are pregnant or breastfeeding)
Bleeding can cause iron loss. Common causes of bleeding are:
- Heavy, long, or frequent menstrual periods
- Cancer in the esophagus, stomach, small bowel, or colon
- Esophageal varices, usually from cirrhosis
- The use of aspirin, ibuprofen, or arthritis medicines for a long time, which can cause gastrointestinal bleeding
- Peptic ulcer disease
The body may not absorb enough iron in your diet due to:
You may not get enough iron in your diet if:
- You are a strict vegetarian
- You are an older adult and do not eat a full diet