The severity of clinical manifestations of iron deficiency anemia is mainly determined by the degree of anemia and its speed of occurrence. Acute blood loss has a rapid onset and can cause obvious clinical symptoms even if the degree of anemia is not severe, while chronic anemia, due to its slow onset, can be gradually adapted by the body through regulation without symptoms. There are usually fatigue, irritability, palpitation, shortness of breath, dizziness and headache. Children show growth retardation and inattentiveness. Some patients have gastrointestinal symptoms such as anorexia, flatulence, nausea and constipation. A few severe patients may develop dysphagia, stomatitis and tongue inflammation. In addition to anemic appearance, there is dry and wrinkled skin and dry and easy hair loss. The nails are thin and flat, not smooth, easily broken, and even spatulate nails are seen in long-term severe patients. Common symptoms of iron deficiency anemia: Symptom 1 yellowish or pale face, tiredness, loss of appetite, nausea and belching, abdominal distension and diarrhea, difficulty in swallowing, dizziness and tinnitus, or even fainting, shortness of breath after activity, palpitations and discomfort, in patients with coronary artery sclerosis, angina pectoris, women may have menstrual irregularities, etc. Symptoms 2 Special manifestations of iron deficiency include: keratitis, tongue papillae atrophy, linguitis, severe iron deficiency may have spatulate nail rebound, loss of appetite, nausea and constipation, European patients often have swallowing difficulties, keratitis and tongue abnormalities. Non-anemic symptoms of iron deficiency: children with growth retardation or abnormal behavior, such as irritability, irritability, inattentiveness in class, omnivorism is a special manifestation of iron deficiency, patients often cannot control eating only one “food”, such as ice, clay, starch, etc., which can disappear after iron treatment. Symptoms 3 Signs: long time patients may have wrinkled nails, not smooth, anti nail, pale skin mucosa, dry skin, dry hair loss, tachycardia, strong heart beat, systolic murmur can be heard in the apical or pulmonary valve area, severe anemia can lead to congestive heart failure, swelling can also occur, about 10% of iron deficiency anemia patients have mild enlargement of the spleen, the cause is not clear, the patient’s spleen is not found in the special No specific pathological changes are found in the spleen of patients, which can disappear after the correction of iron deficiency, and retinal hemorrhage and exudation are seen in a few patients with severe anemia.