HB in medical terms refers to hemoglobin, a special protein contained in red blood cells, consisting of bead protein and hemoglobin, which plays an important role in the normal physiological functions of the human body. The main function of hemoglobin is to transport oxygen and carbon dioxide, because hemoglobin can combine with oxygen to form oxyhemoglobin, which is transported to the tissue cells of the body that need oxygen through blood circulation, and at the same time, it can form carbon dioxide produced by the body’s metabolism into carboxyhemoglobin, which is transported to the lungs and discharged out of the body. If the concentration of hemoglobin decreases, that is, anemia occurs, the patient’s ability to carry oxygen decreases, and the symptoms of tissue hypoxia are produced, and the organism produces insufficient energy and a series of symptoms such as dizziness, pallor, weakness, and laziness of the limbs.