Low erythrocyte pressure volume may be caused by physiological reasons, hemolytic anemia, aplastic anemia and so on. 1. Physiological reasons: if you usually drink too much water or during menstruation, etc., it may have an effect on blood volume, leading to a decrease in the number of red blood cells and low erythrocyte pressure volume. 2. Hemolytic anemia: when the patient has hemolytic anemia, it will easily lead to anemia disease, causing a decrease in red blood cells and low cell pressure product. 3. Aplastic anemia: when the bone marrow hematopoietic function is impaired, it will easily lead to a decrease in the number of red blood cells, platelets, white blood cells, etc., and low erythrocyte pressure product. If you have low erythrocyte hematocrit, you should go to the hospital in time to get a clear picture of the cause of the disease and then take appropriate treatment under the guidance of the doctor.