Mental illnesses are health conditions involving changes in emotion, thinking or behavior (or a combination of these). Mental illnesses are associated with distress and/or problems functioning in social, work or family activities. Mental illness is common.

What is the difference between a mental illness and a mental disorder?

Once psychologists and scientists found that mental illnesses are a disease of the body, they began to use the term mental illness more widely. The main difference between a mental disorder and a mental illness is the origin of the condition.