Mental disorders are real illnesses that can affect a person's thoughts, feelings and behaviors, preventing them from living a happy, healthy life. Throughout history, mental illness has been stigmatized as being caused by demons or personal weakness. Today, though our understanding of mental disorders has increased, some stigma still remains. This stigma can negatively impact people's access to insurance, housing, jobs and treatment. It is important to understand that mental disorders are treatable medical conditions, and that understanding builds compassion for those suffering from them. Common mental disorders include depression, anxiety disorders, bipolar disorder, schizophrenia and obsessive-compulsive disorder.