What are the signs of a respiratory infection in a reptile?

According to UK vets at Vet Help Direct, watch for increased breathing rate and effort, nasal discharge, lethargy and loss of appetite. In tortoises, the British Chelonia Group flags runny noses and watery eyes, which can progress to pneumonia.

Can a reptile respiratory infection clear up on its own?

Very mild cases may improve when husbandry is corrected — proper humidity, ventilation, warmth and diet. But reptiles hide illness well, so anything beyond the mildest signs needs an exotic vet; untreated infections can descend into pneumonia.

Why does my bearded dragon have a respiratory infection?

The usual triggers are humidity that is too high for a desert species, poor ventilation, and vitamin A deficiency, according to Vet Help Direct. Chronically low temperatures also weaken immunity, letting bacteria and fungi take hold.

Is a reptile respiratory infection contagious?

It can be. The British Chelonia Group advises that tortoises with runny noses are infectious and should be isolated from other tortoises. Always wash hands and equipment between enclosures when one reptile is unwell.

How do I prevent respiratory infections in reptiles?

Keep humidity in the species-correct range, ventilate the vivarium well, hold basking and night temperatures on target with thermostats, and feed a balanced, supplemented diet. Most UK reptile respiratory disease traces back to husbandry.

Reptile Health

Reptile Respiratory Infection: UK Guide

Published 18 July 2026Last updated 18 July 20264 min read

Quick answer

Respiratory infections are among the most common reptile illnesses UK exotic vets see — usually triggered by wrong humidity, poor ventilation or low temperatures. Signs include nasal discharge, wheezing, open-mouth breathing and lethargy. Mild cases may respond to husbandry fixes; anything more needs an exotic vet.

Key takeaways

Respiratory infections are among the most common reptile illnesses UK exotic vets see — usually triggered by **wrong humidity, poor ventilation or low temperatures**.
Signs include **nasal discharge, wheezing, open-mouth breathing and lethargy**.
Mild cases may respond to husbandry fixes; anything more needs an exotic vet.

What is a respiratory infection?

Respiratory infections in reptiles are bacterial or fungal infections of the airways. According to Vet Help Direct's UK vet team, excessive humidity and vitamin A deficiency predispose reptiles to them. The British Chelonia Group (BCG) describes the tortoise version — rhinitis or 'runny nose syndrome' — and warns it can progress from the upper airways down into pneumonia in the lungs.

Reptiles are ectothermic, so their immune system only works properly at the right body temperature. A reptile kept too cold for too long has weakened defences — which is why respiratory problems spike in UK homes during winter (see Reptile winter heating UK).

Common causes

Humidity too high for the species — a bearded dragon in a damp vivarium is a classic UK example; desert species need around 30–40%
Poor ventilation — the RSPCA stresses good airflow is essential to reduce respiratory infection risk
Low temperatures — chronic chilling slows metabolism and immunity
Vitamin A deficiency — from poor diet and lack of supplementation
Draughts and damp — vivariums in cold rooms, conservatories or near windows in winter
Spread between animals — the BCG notes respiratory infections are infectious; isolate unwell tortoises

Signs by species

Sign	Lizards	Snakes	Tortoises
Nasal discharge / bubbles	Yes	Yes	Runny nose, watery eyes
Breathing changes	Faster, harder breathing; open-mouth breathing	Wheezing, breathing with mouth open	Progression to pneumonia if untreated
Behaviour	Lethargy, appetite loss	Lethargy, refusing food	Lethargy, off food
Other	—	Excess mucus around the mouth	Often follows hibernation problems

Any breathing noise in a reptile is abnormal — healthy reptiles breathe quietly.

When to see an exotic vet

According to Vet Help Direct, mild cases may improve by correcting humidity and diet, but more severe cases need veterinary attention and medication. Book a UK-registered exotic vet without delay if you see:

Open-mouth breathing or gaping in any reptile
Nasal discharge, bubbles or mucus around the mouth
Noticeably faster or more laboured breathing
Lethargy with appetite loss lasting more than a day or two alongside breathing signs
A tortoise with a runny nose — especially after hibernation — as pneumonia risk is real

Do not attempt home antibiotic treatment or guess doses — reptile medication must be prescribed and dosed by an exotic vet for the species and weight.

Prevention

Match humidity to the species — around 30–40% for bearded dragons and leopard geckos, 40–50% for corn snakes; measure with a hygrometer
Ventilate — stuffy, wet vivariums breed bacteria and fungi; add vents rather than sealing heat in
Hold temperatures steady — correct basking zones by day and safe minimums at night, all on thermostats with daily thermometer checks
Feed for immunity — varied diet with proper vitamin and mineral supplementation as directed for the species
Quarantine and isolate — keep new reptiles separate, and isolate any animal showing respiratory signs
Clean regularly — spot-clean waste daily and fully disinfect the vivarium monthly with a reptile-safe product

Sources & further reading

Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.

PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-07-18).

Frequently Asked Questions

What are the signs of a respiratory infection in a reptile?: According to UK vets at Vet Help Direct, watch for increased breathing rate and effort, nasal discharge, lethargy and loss of appetite. In tortoises, the British Chelonia Group flags runny noses and watery eyes, which can progress to pneumonia.
Can a reptile respiratory infection clear up on its own?: Very mild cases may improve when husbandry is corrected — proper humidity, ventilation, warmth and diet. But reptiles hide illness well, so anything beyond the mildest signs needs an exotic vet; untreated infections can descend into pneumonia.
Why does my bearded dragon have a respiratory infection?: The usual triggers are humidity that is too high for a desert species, poor ventilation, and vitamin A deficiency, according to Vet Help Direct. Chronically low temperatures also weaken immunity, letting bacteria and fungi take hold.
Is a reptile respiratory infection contagious?: It can be. The British Chelonia Group advises that tortoises with runny noses are infectious and should be isolated from other tortoises. Always wash hands and equipment between enclosures when one reptile is unwell.
How do I prevent respiratory infections in reptiles?: Keep humidity in the species-correct range, ventilate the vivarium well, hold basking and night temperatures on target with thermostats, and feed a balanced, supplemented diet. Most UK reptile respiratory disease traces back to husbandry.