Rare diseases · Sign or symptom

Alexia

Text blindness

HP:0010523

What it means

An acquired type of sensory aphasia where damage to the brain leads to the loss of the ability to read.

Note that dyslexia refers to a developmental reading disability, whereas alexi arefers to an acquired reading disability related to damage to the brain in an individual in whom reading ability had previously been developed.

Rare diseases that can present with this3

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

Also called: Word blindness

Alexia

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This 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.