Health is an issue of great concern to people, and once a problem arises, our mood will be depressed. Some minor problems, though not very serious, do affect our lives and studies, such as anemia. We are not unfamiliar with the term “anemia”, and we often hear people say: “I don’t look good recently, I went to the hospital for a checkup, but I am a little anemic, it’s not a big deal. The more common the symptoms are, the less attention is paid to them. It is true that for adults, mild anemia does not cause much harm to the body. However, for people with poor health, if the body is in a state of anemia for a long time without control, it may cause adverse effects on several systems of the body. When the body is anemic, the hemoglobin decreases, the oxygen-carrying capacity of the blood decreases, and the whole body tissues and organs become hypoxic, thus causing a series of hazards to the body. The most common ones are: 1) General: (1) Poor physical strength: fatigue, sleepiness and weakness, which are the earliest and most common manifestations of anemia (2) Poor color: pale color of the face, lips, eyelids and nail bed (3) Fever: low fever may occur in severe anemia (4) Mental state: mental abnormalities, such as excitement, depression and reticence, may occur. (5) Other: dry skin, lack of luster of hair, pestle fingers, etc. 2. Cardiovascular system: Chest tightness, panic, shortness of breath may occur, and some severe cases may show compensatory enlargement of the heart or angina pectoris, heart failure, etc. (1) In mild anemia, sinus tachycardia and hyperacusis may appear. (2) In severe anemia, lower limb edema, heart failure and angina pectoris may appear. 3. Nervous system: “Starry-eyed” or transient blackness in front of the eyes during postural changes is a symptom of anemia affecting the nervous system, and other common symptoms include dizziness, headache, tinnitus, lack of concentration, insomnia, and slow reaction. 4. Digestive system: Loss of appetite is the most common digestive tract symptom, and symptoms such as loss of appetite, abdominal distension and nausea may also occur. 5. Genitourinary system: deepening of urine color, proteinuria and other manifestations may occur. Severe anemia may show loss of libido, soy sauce-colored or thick tea-colored urine and other manifestations. The most common symptom in female patients is irregular menstruation. Besides, some special groups of people may also have some different manifestations: 1. Women: Besides the common decrease in menstrual flow or even amenorrhea, the most common symptoms are cold hands and feet, yellow face and endocrine disorders. Severe anemia in pregnant women can lead to serious consequences such as premature birth, stillbirth, fetal dysplasia and stillbirth. 2.Children: Children with long-term anemia will affect development, pale face, memory loss and other symptoms. 3.Elderly people: Elderly patients with long-term anemia can have increased risk of brain hemorrhage, gout and other diseases. Many people have anemia, but don’t have the mentality that it doesn’t matter if you cure it or not. Anemia can be harmful to the body in many ways. If it occurs, please go to the hospital in time to avoid long-term anemia from causing more damage to the body.