Rare diseases · Sign or symptom

Long penis

Enlarged penis

HP:0000040

What it means

Penile length more than 2 SD above the mean for age.

Penile length is the distance between the midline attachment of the gently stretched, flaccid penis above the pubic symphysis and tip of the glans.

Rare diseases that can present with this10

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

Long penis

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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.