Who is then defining what is schizophrenia?
Is it a physician? Does it have any pathological evidences?
The clear answer is NO.
So it cannot be a disease.
It is defined by psychiatrists by voting the "disorders" in their meetings of American Psychiatric Association. Such disorders are then published in the Diagnostic and Statistic Manual: https://en.wikipedia.org/wiki/Diagnostic_and_Statistical_Man...
Further, by researching, one will come to conclusion that those mental disorders are added and removed as their assembly wants it. Or whatever the lobby wants.
It would be good to review the writings of Dr. Thomas Szasz:
https://en.wikipedia.org/wiki/Thomas_Szasz
https://www.cchrint.org/about-us/co-founder-dr-thomas-szasz/...
For human problems there exist human solutions.
How can be a "disorder" which cannot be pathologically proven be "healed" by taking more and more drugs?