Stem cell therapy can treat a wide range of diseases such as tumors (leukemia), hemophilia, diabetes, cosmetic surgery, and cardiac malformations. Stem cells are cells that are not yet fully differentiated and immature, with the potential to regenerate various tissues and organs. Because stem cells can differentiate other cells, they can be applied to leukemia to renew normal blood cells for leukemia patients; fat stem cells can be applied to mammoplasty; and applied to cardiac malformations can make the heart shape return to normal. Stem cell therapy is currently used in many fields and is a commonly used method in clinical treatment. Currently, stem cell therapy has achieved significant results in the treatment of leukemia, but the safety and quality control of other areas still need to be studied. Patients can consult with their doctors about whether they can undergo stem cell therapy.