What is an overview of how Christians discern genuine cases of demonic influence from mundane mental health problems?

This question is a nuanced version of my recently asked question https://christianity.stackexchange.com/q/86124/50422 , this time aiming to address the 'dark side'. A very insightful [answer](https://christianity.stackexchange.com/a/86135/50422) to the aforementioned question brought up an important point: > However, **if the spiritual experience is not an hallucination but a demonic trick**, then the person is in deep spiritual trouble and will need help from mature Christians. I know of such instances, but not personally. Christians should know that they are warned in the Bible that a satanic influence can appear as an 'angel of light' (2 Cor.11:14; Gal.1:8; Rev.13:13-14). A Christian's safeguard from that is to utilise the full symbolic 'armour of God' as detailed in Eph.6:10-18. **Question**: What is an overview of how Christians discern genuine instances of demonic influence (ranging from counterfeit spiritual experiences to full-blown demonic possession) from mundane mental health problems? What follows is not mandatory, but a particular case I'd like answerers to think about is that of individuals locked up in psych wards. Is it possible that people locked up in psych wards may actually be suffering from a demonic problem rather than a psychiatric one? If so, would it be possible in principle for people in psych wards to recover their soundness of mind through a process of demonic deliverance carried out by a mature Christian? _________ Related: https://christianity.stackexchange.com/q/34332/50422