Low red blood cells can be seen in anemia, and the diagnostic criteria for anemia are mainly based on the hemoglobin index. 1. Low red blood cells will cause a decrease in hemoglobin concentration, and a decrease in hemoglobin concentration in blood routine can be diagnosed as anemia. 2. However, low red blood cells may also be associated with excessive water intake prior to the examination, malnutrition, excessive blood loss, leukemia and other factors. Low red blood cells need to be alerted to the possibility of anemia. If it is determined that low red blood cells are related to anemia, etiological treatment is required, such as the appropriate use of iron agents, such as ferrous succinate, to treat iron-deficiency anemia, and so on, and the use of medication needs to be guided by a doctor. It is recommended that when you find yourself with low red blood cells, you should consult a regular hospital for a detailed examination.