Severe anemia is a classification of anemia according to its severity into mild, moderate, severe and very severe. There are many reasons for the occurrence of severe anemia, which are roughly divided into three categories, the first is the decrease of red blood cell production, the second is the increase of red blood cell destruction, and the third is the loss of blood, manifested by skin Mucous membrane pallor, headache, dizziness, tinnitus, muscle weakness, fatigue, fast breathing, shortness of breath, dyspnea even in a quiet state, reduced appetite, nausea, abdominal distension, menstrual cycle disorders in women of childbearing age, etc.