It can be difficult for people to wrap their heads around the fact mental disorders can be a result of the brain's chemistry. It is because of this that so many individuals misunderstand the use of medicine to treat mental disorders. However, mental disorders, like any physical disorder, can be helped by medicine. In the same way you may want to have medical treatment to treat the flu or to ease a headache, you can also use medicine to change your brain chemistry and overcome mental illness. An imbalance of the brain's chemistry can lead to many different kinds of mental disorders, including depression. While chemistry, like genetics, is typically not the sole source of mental disorder in a patient, it can be one of the largest contributors.