Does mental illness always progress?

It is difficult to answer unequivocally without having information about what illness you are asking. For example, some patients have only one episode of depression in their lives, but for most it is recurrent. In the case of treated schizophrenia, remission with significant improvement is possible, but sometimes the patient does not return to the full health he enjoyed before the disease. Symptoms - if they remain - can remain at approximately the same level, but with an unfavorable course of schizophrenia there are no longer periods of improvement, and the disease gradually progresses. There are many different mental illnesses, differing in course and prognosis. In general, it is best to ask the doctor who deals with it about an individual case. I enclose helpful links: https://www.gdziepolek.pl/telekonsultacja https://www.gdziepolek.pl/kategorie/choroby-psychiczne-i-zaburzenia-psychologiczne https://www.gdziepolek.pl/artykuly/tajemnicze-zaburzenia-i-choroby-psychiczne