What is the main cause of insanity?

Insanity is not a well-defined medical or psychological term, and it is no longer used as a clinical diagnosis. However, mental illnesses and disorders can cause significant disturbances in a person's thoughts, emotions, and behaviors. The causes of mental illnesses are complex and can vary depending on the specific disorder. They are generally believed to be a result of a combination of genetic, biological, environmental, and psychological factors. It is important to note that mental illnesses are not caused by a single factor, but rather a combination of multiple factors.