Rare diseases · Sign or symptom
Visual hallucination
Visual hallucinations
HP:0002367
What it means
Visual perception in the absence of a visual stimulus.
Rare diseases that can present with this15
Common30–79%
4Sometimes5–29%
10- Bilateral parasagittal parieto-occipital polymicrogyria
- Epilepsy with auditory features
- Familial focal epilepsy with variable foci
- Giant cell arteritis
- Hereditary late-onset Parkinson disease
- Marchiafava-Bignami disease
- Niemann-Pick disease type C
- Posterior cortical atrophy
and 2 more in this range
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Tracking symptoms like this for someone? Eleplan keeps symptoms, diagnoses, medications and every specialist in one plan.
Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.