By definition, anemia is primarily a decrease in peripheral blood erythrocytes. From the point of view of hematopoietic components, anemia is commonly associated with deficiencies of iron, folic acid, and vitamin B₁₂, among others. 1. In terms of indicators, anemia mainly refers to the reduction of red blood cells in the peripheral blood of the human body, which is mainly manifested as dizziness, tinnitus, insomnia, pallor, and so on. 2. In terms of etiology, since the necessary components for the synthesis of red blood cells are iron, folic acid, and vitamin B₁₂, a deficiency of these three components can also cause anemia. In addition, anemia is also seen in aplastic anemia, leukemia and other blood system diseases. Patients with anemia are advised to eat more iron-containing foods, such as animal liver, in their daily diet. If you want to supplement folic acid, you can consider eating more vegetables, while vitamin B₁₂ is mainly from animal meat, offal, fish and other foods. Specific anemia diagnosis and treatment should be under the guidance of a physician.