ental illnesses are specific conditions that negatively affect how a person feels, thinks, or behaves. Examples of mental illness include anxiety, depression, bipolar disorder, and schizophrenia. Even mentally healthy people can experience conditons such as anxiety and depression; people with mental illnesses such as schizophrenia and bipolar disorder can also have periods of relative order. Conditions may be occasional or long-lasting (chronic) and affect people’s daily fuctions and relation to others.
Mental illness can be caused by biology, including the genes you were born with and how your brain develops over time, by experiences, such as early or ongoing trauma, or damage from traumatic brain injury or substance use.