Rare diseases · Sign or symptom
Trismus
Lockjaw
HP:0000211
What it means
Limitation in the ability to open the mouth.
Rare diseases that can present with this12
Common30–79%
5Sometimes5–29%
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: Decrease in jaw mobility · Decrease in jaw movement · Decrease in jaw opening · Decrease in mandibular mobility · Decrease in mandibular movement · Decrease in mandibular opening · Limited jaw mobility · Limited jaw movement
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.