Iron deficiency anemia is the most common form of anemia and develops over time due to insufficient iron intake or absorption to produce new red blood cells. Symptoms include fatigue, pale skin, dizziness, and shortness of breath. Treatment involves oral iron supplements like ferrous sulfate taken on an empty stomach, which can take 3-6 months to replenish iron stores. Parenteral iron is used for patients who cannot tolerate oral supplements or have malabsorption issues. Dietary sources of iron like meat, fish, and leafy greens can also help non-pharmacologically.