The function of normal red blood cells is to transport oxygen to the tissues of the whole body through the blood circulation of the whole body. When the number of red blood cells is insufficient, the tissue will be hypoxic. Mild anemia is not felt, so it is often ignored, but when anemia is serious, dizziness, tiredness, general discomfort, heart palpitations, pale complexion, wheezing, lethargy, loss of appetite, and some people may experience insomnia and loss of appetite. Symptoms such as hair, inattention, etc.