---
title: "Late-Onset Psychosis"
url: https://mghmclean.org/residents/handbk/part2b/late.htm
description: "source : Webster J, Grossberg T (1998) Am J Geriatr Psychiatry 6:196-202."
published: 2026-08-10
updated: 2026-08-10
---

# Late-Onset Psychosis

Published 2026-08-10

PART 3 / CH 43

Roy Perlis

New-onset psychosis (age ³65)

| Diagnosis | % |
|---|---|
| Dementia | 40 |
| Major Depression | 33 |
| Medical etiologies(seizure, hypothyroid, Parkinson’s, hyperglycemia, UTI) | 7 |
| Delirium | 7 |
| Bipolar Disorder | 5 |
| Med Toxicity | 4 |
| Delusional Disorder | 2 |
| Schizophrenia | 1 |
| Schizoaffective | 1 |

*source*: Webster J, Grossberg T (1998) Am J Geriatr Psychiatry 6:196-202.