Which can result in anemia?

Sudden massive bleeding can lead to anemia because it results in a significant loss of blood volume and red blood cells. Blood carries hemoglobin, which is essential for transporting oxygen throughout the body. When there is a sudden loss of blood, such as from an injury or medical condition, the body may quickly become deficient in red blood cells, leading to decreased oxygen-carrying capacity. This condition, known as hemorrhagic anemia, manifests rapidly and can result in symptoms like fatigue, weakness, and pallor.

In contrast, excessive exercise usually leads to increased red blood cell production over time as the body adapts to physical stress, while a high intake of fish and vegetables typically provides essential nutrients that support overall health and may even help in the formation of healthy blood cells. Genetic mutations can lead to various blood disorders, but they do not always result in anemia directly and often require specific conditions to express such as sickle cell disease or thalassemia. Thus, the option of sudden massive bleeding stands out as a clear and immediate cause of anemia.