Red blood cells are useful to the body for transporting metabolites, oxygen and carbon dioxide, and enhancing immune function. The color of hemoglobin in red blood cells is generally red, which can make human blood appear red, so the cells are called red blood cells in medicine. Erythrocytes transport carbon dioxide produced by the organs and tissues of the human body to the alveoli to expel the carbon dioxide from the body, after the carbon dioxide and hemoglobin in the human body combine. Red blood cells also transport oxygen and body metabolites. In addition, red blood cells have a role in the human immune system, for example, red blood cells can assist lymphocytes and the body’s white blood cells, the body there are abnormal invasion of viruses, bacteria and other pathogens to remove. Therefore, red blood cells play an important role in the human body, if the red blood cells appear abnormal, it is recommended to go to the hospital in a timely manner to check, identify the cause of the disease, and then according to the cause of the symptomatic treatment.