Which type of anemias occur from premature destruction of red blood cells?

Hemolytic anemias specifically arise from the premature destruction of red blood cells (RBCs), which leads to a decreased lifespan of these cells in the circulation. This destruction can occur due to various factors, including autoimmune reactions, infections, hereditary conditions, or mechanical damage. As red blood cells are destroyed faster than they can be produced, the body struggles to maintain an adequate number of RBCs, resulting in anemia.

On the other hand, iron deficiency anemias are typically caused by insufficient iron, affecting the body's ability to produce hemoglobin, leading to smaller and fewer red blood cells. Macrocytic anemias, often related to vitamin B12 or folate deficiency, are characterized by the production of unusually large red blood cells. Microcytic anemias, such as those associated with chronic disease or thalassemia, involve smaller than normal red blood cells but do not necessarily involve their premature destruction.