Schizophrenia is definitely a genetic disorder, not a psychological disorder. Google it.
Stuff going on in the brain, can have several causes. Physical, electro-chemical, experiential, etc.
For example if the brain's ventricles overfill with fluid, place excess pressure on the brain organ, it can cause physical and behavioral changes.
NPH=normal pressure hydrocephalus.
It impacts walking gait, urinary problems, memory/cognition.
Can be treated with a shunt, which drains excess fluid, relieving pressure, and usually restores some of the previously lost functionality. I hope.