Thalassemia is genetically related and the exact age of onset of mild cases varies from person to person. Some patients may have thalassemia at birth, but the affected children are no different from most newborns and the symptoms of mild thalassemia are usually undetectable. Thalassemia is a genetic defect disease. Mild cases are mild and may be asymptomatic at birth and do not interfere with daily life. However, as the patient grows older, symptoms such as anemia, fatigue, edema, enlarged liver and spleen, and mild jaundice may appear. Since thalassemia is hereditary, if the parents have thalassemia, the fetus may also be born with the disease. Therefore, it is recommended that pregnant women be screened for thalassemia during pregnancy to effectively prevent the birth of affected children. In addition, since patients with mild thalassemia are usually combined with iron deficiency anemia, they should pay attention to eating iron-rich foods such as pig’s blood, lamb’s blood, purple cabbage and black fungus in their daily life to avoid aggravation of anemia.