Rare diseases · Sign or symptom
Abnormal hair quantity
HP:0011362
What it means
An abnormal amount of hair.
Rare diseases that can present with this20
Very common80–99%
9- Aplasia cutis congenita-intestinal lymphangiectasia syndrome
- Atypical Werner syndrome
- Bamforth-Lazarus syndrome
- Deafness-enamel hypoplasia-nail defects syndrome
- Distal duplication 6p syndrome
- Hypogonadism-mitral valve prolapse-intellectual disability syndrome
- Microcephalic primordial dwarfism, Montreal type
- Nijmegen breakage syndrome
- Rhizomelic syndrome, Urbach type
Common30–79%
6The 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: Abnormality of hair density
Abnormal hair quantity
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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.