Stem cells show importance in numerous different areas. They help us by giving us a better understanding of cell development, which will lead us into knowing how to correct errors that create medical conditions. They also generate healthy cells to replace old or diseased cells; moreover, they have the potential to reverse diseases. Stem cells have the ability to improve memory, treat hair loss, re-attach teeth, reduce wrinkles, and many more effects. Stem cell therapy is an intervention method that introduces new adult stem cells into damaged tissue, so that it can the disease or injury. The most familiar type of Stem Cell Therapy is Bone Marrow Transplantation, which is used to treat cancers of the blood cells. To exterminate the white blood cells and bone marrow of the cancer patient, chemotherapy and radiation therapy is used. Then a sample of a bone marrow from a healthy donor is injected into the patient. Afterwards, the stem cells multiply in the patient’s bone marrow and begin producing healthy blood cells. There are some risks to this therapy. One risk is when the transplanted cells see the patient’s cell as alien and tries to attack them. That forms into a disease called Graft versus Host Disease (GvHD). Also there is a risk of developing an infection is greater than before the transplant. To prevent these risks, it would be better to be younger, receive a donor from a sibling, and have no other health conditions. Recovery from a bone marrow