Schizoaffective disorder and schizophrenia are separate mental disorders. Learn about both, including symptoms, risk factors, and treatment.

Psychiatrist Stephan Taylor, M.D., has treated patients with psychosis for decades. He's done research on why people suffer delusions, paranoia, hallucinations and detachment from reality, which can drive them to suicide or dangerous behavior.

Hallucinations come in many forms including visual, auditory, and tactile. Hallucinations could be the result of a brain tumor, vision loss, or a degenerative disease. Other causes include lack of sleep, medication side effects, infection, or illicit drug use.

On his first full day in jail, former Brazilian President Jair Bolsonaro told a judge on Sunday he had violated his ankle monitoring the day before at his house arrest because of a nervous breakdown and hallucinations caused by a change in his medication.