Rare diseases · Sign or symptom
Hyperplasia of the maxilla
Big maxilla
HP:0430028
What it means
Abnormally increased dimension of the maxilla, especially relative to the mandible, resulting in a malocclusion or malalignment between the upper and lower teeth or in anterior positioning of the nasal base, increased convexity of the face, increased nasolabial angle, or increased width (transverse dimension of the maxilla.
Rare diseases that can present with this10
Very common80–99%
3Common30–79%
3The 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: Big upper jaw · Hyperplasia of upper jaw · Hypertrophy of maxilla · Hypertrophy of upper jaw · Increased projection of maxilla · Increased projection of upper jaw · Increased size of maxilla · Increased size of upper jaw
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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.