The term mental health refers to how you process information. Those in good mental health are able to process information and engage their emotional selves in a well integrated way that encourages feeling, processing, and regulating. Everyone has the ability to experience good mental health.
Mental health can also change with circumstances. Some experience declines or changes in their mental health because of external factors like finances, death, or relationships. Still some, were never given good healthy self integrated understanding of how to manage mild stressors or more severe stressors. Many are also affected by trauma, which can essentially damage the processing system. While this is true, we understand that most people, if not all, have the capacity to earn a secure attachment and good mental health.