This document provides information on anemia, including its definition, classification, pathophysiology, and specific types. Key points: - Anemia is defined as a low red blood cell count, low hemoglobin levels, or low packed red blood cell volume. It results in an inability to meet oxygen demands. - Anemia can be classified as microcytic, normocytic, or macrocytic based on mean corpuscular volume. It can also be classified based on cause such as blood loss, decreased production, or increased destruction. - Common types of anemia discussed include iron deficiency anemia, thalassemia, sickle cell disease, hereditary spherocytosis, glucose-6-