I do not believe there is definite method to monitor psychological illness. A machine can be repaired. An organic disease or physiological condition may be curable but psychology deals with human behaviour. That makes it impossible to have straight jacket norms for mental health. Aggression, sadness, short temper, attention deficit, excessively passive, extremely fearful, phobias all these things can be classified as illnesses. Every human being has these emotions and unless chronic disfunctionality is evident you will have to let them continue. There are subjective criteria for mental sickness and is very difficult to apply. The treatments also have their own credibility issues. The word cure is rarely used in psychiatry. It is only to control within acceptable behaviour norms.