Do mental health and mental unhealthy belong to the scope of mental normality?

Belong to.

Everyone's mental state may be influenced by external environment, personal experience, genes and many other factors. Some short-term mood swings, stress reactions, anxiety, etc. Everything is normal, and it is inevitable to encounter these situations in life.

Mental health means that a person is in a stable and good state psychologically, emotionally and socially, can actively cope with the challenges and pressures in life, and has sufficient self-regulation ability. Mental unhealthy refers to a person's mental, emotional or behavioral problems, unable to effectively cope with the challenges and pressures in life, and even affecting normal life and work.