Iron deficiency anemia is the most common type of anemia globally. It is caused by lack of sufficient iron intake and absorption to meet physiological needs, especially during periods of growth. Symptoms include fatigue, weakness, and pallor. Diagnosis involves blood tests showing microcytic hypochromic anemia. Treatment focuses on iron supplementation either orally or via injection, along with addressing any underlying causes of blood loss or impaired absorption. Preventive measures include antenatal iron/folic acid supplements, exclusive breastfeeding, and iron fortification of complementary foods.