Rare diseases · Sign or symptom
Thick hair
Increased hair density
HP:0100874
What it means
Increased density of hairs, i.e., and elevated number of hairs per unit area.
Rare diseases that can present with this18
Very common80–99%
3Common30–79%
10- 9q31.1q31.3microdeletion syndrome
- Autosomal recessive cutis laxa type 2A
- COG4-CDG
- Cognitive impairment-coarse facies-heart defects-obesity-pulmonary involvement-short stature-skeletal dysplasia syndrome
- Cohen syndrome
- Hall-Riggs syndrome
- Mitochondrial myopathy-cerebellar ataxia-pigmentary retinopathy syndrome
- Mucopolysaccharidosis type 3
- Rabson-Mendenhall syndrome
- Trisomy 20p syndrome
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: Increased follicular density
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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.