top misconceptions about mental illness I've encountered in no particular order
1: its just a phase: whilst mental illness can be cyclic there is no school of thought that says without treatment that a mental illness will just pass. and without treatment it will get worse.
2. pop a pill and you will be fine... sometimes for some people, a slight change of chemicals in the brain provided by a pill may slightly or will help entirely. this is only in a small amount of cases however, and it is still recommended that people that take any form of antidepressants seek other help, such as counseling or psychotherapy to discuss the changes going on