The subject of mental illness is very controversial in Christian circles. Inside the extreme schools of thought, we find balance and a scriptural viewpoint.
First, let me say clearly: All mental illness is not the result of demonic attack. Further, good psychological care from Christian professionals is vital and in order when an individual is struggling.
Also, professionally administered medication may be necessary when chemical imbalances occur. But when normal medicine and therapy do not result in a cure, then it is possible that these symptoms could point to demonic operation.