These are just some examples of neurological diseases in which stem cell treatment has been researched. In general, the future looks promising for stem cell application in the field of neurology. However, possible complications lie in the overall ethics of stem cell use, possible recipient rejection, as well as over-proliferation of the cells causing possible brain tumors. Ongoing research will further contribute in the decision of whether stem cells should be used in the brain and whether their benefits truly outweigh their costs.