The dangers of thalassemia include: 1) anemia leading to anemic heart disease, enlarged spleen, etc.; 2) bone mutation; 3) reduced immunity leading to repeated infections in patients; 4) iron overload deposited to the heart, liver and pancreas, leading to heart failure, liver cirrhosis, gastrointestinal bleeding and diabetes, etc. Patients with thalassemia minor or stationary type can survive normally; intermediate type requires blood transfusion if severe anemia occurs; non-transfusion-dependent patients need iron removal; patients with beta thalassemia major generally have their lives terminated until 20-30 years old due to anemia and iron overload; patients with alpha thalassemia major have fetal edema syndrome in the mother and generally cannot survive; patients with alpha thalassemia intermediate have a longer survival period, but are chronically accompanied by anemia.