---
title: Flaccid vs erect penis size. Medical explanation
description: Medical explanation of why flaccid and erect penis size differ and how treatments affect appearance.
image: https://moorgateandrology.co.uk/hubfs/MAC-038.png
---

 Dec 16, 2025 8:15:28 AM

# Flaccid vs erect penis size. Medical explanation

[ David Mills ](https://moorgateandrology.co.uk/knowledgebase/author/david-mills)

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It is normal for penile size to differ significantly between the flaccid and erect states.

Flaccid size is influenced by temperature, stress, and circulation, while erect size is more consistent and dependent on erectile tissue expansion.

Medical treatments such as penis enlargement surgery may increase flaccid length and girth permanently, while penis fillers increase girth temporarily.

Related pages:

- https://moorgateandrology.co.uk/penis-enlargement-surgery/
- https://moorgateandrology.co.uk/penis-fillers/

[Penis Enlargement Surgery](https://moorgateandrology.co.uk/knowledgebase/tag/penis-enlargement-surgery)

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