What is the most common cause of anemia?

The most common cause of anemia is iron deficiency. Iron is an essential mineral that is involved in the production of red blood cells. When iron levels are low, the body cannot produce enough red blood cells, which leads to anemia. Iron deficiency can be caused by a number of factors, including:

* Inadequate intake of iron: This can occur due to a diet that is lacking in iron-rich foods, such as red meat, poultry, fish, legumes, and dark leafy greens.

* Blood loss: Heavy menstrual bleeding, gastrointestinal bleeding, and trauma can all lead to iron deficiency.

* Malabsorption: Certain conditions, such as celiac disease and Crohn's disease, can interfere with the absorption of iron from food.

* Increased demand for iron: Pregnancy, childhood, and adolescence are all times when the body's demand for iron is increased.

Anemia can also be caused by a number of other factors, including:

* Certain medications: Some medications, such as chemotherapy and nonsteroidal anti-inflammatory drugs (NSAIDs), can interfere with the production of red blood cells or cause blood loss.

* Vitamin B12 deficiency: Vitamin B12 is involved in the production of red blood cells. A deficiency of this vitamin can lead to anemia.

* Folate deficiency: Folate (vitamin B9) is also involved in the production of red blood cells. A deficiency of this vitamin can lead to anemia.

* Chronic diseases: Certain chronic diseases, such as cancer, kidney disease, and heart disease, can lead to anemia.