Pneumonia in iguanas
Pneumonia is an infection or inflammation of the iguana's lungs. It mainly affects iguanas kept in poor breeding conditions. This is a common veterinary emergency in this reptile in captivity. In the iguana, the lungs occupy a large part o...
What is it?
Pneumonia is an infection or inflammation of the iguana's lungs. It mainly affects iguanas kept in poor breeding conditions. This is a common veterinary emergency in this reptile in captivity.
In the iguana, the lungs occupy a large part of the body and function differently from those of mammals. A lung infection often progresses slowly, sometimes delaying the time the owner notices a problem.
Key point
Untreated pneumonia can be quickly fatal in iguanas, especially in young animals or if treatment is delayed.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
The sick iguana breathes with effort, sometimes with its mouth open. You may hear an abnormal noise, such as whistling or clicking, with each breath.
A discharge may appear from the nostrils or mouth. The animal salivates more than usual and may make head movements to try to clear its airways.
The iguana becomes despondent, stays still longer than usual, and refuses to eat. He may also seek a particular position, such as standing upright on his front legs, to make breathing easier.
These signs often appear gradually, over several days or even weeks.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Pneumonia is most often of bacterial origin, sometimes associated with fungi or parasites. It rarely occurs in a healthy, well-maintained iguana.
In the vast majority of cases, the root cause is a lack of maintenance: insufficient or poorly adapted temperature in the terrarium, excessive or insufficient humidity, poor ventilation, or chronic stress. These factors weaken the iguana's natural defenses and allow bacteria normally present in its environment to become pathogenic.
Accidental inhalation of food, water or substrate can also trigger pneumonia through irritation and then infection of the deep respiratory tract.
The main risk factors are linked to captivity conditions: terrarium temperature too low or too unstable, lack of correct thermal gradient, unsuitable humidity, poor terrarium hygiene, overcrowding, or absence of a heat source allowing good digestion and immunity.
An iguana that is stressed, recently acquired, in poorly managed quarantine, or suffering from another illness (nutritional deficiency, parasitosis) is more vulnerable.
Young iguanas and weakened animals are more susceptible to severe forms.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian begins with a complete clinical examination, listening to breathing and observing behavior. He questions the owner about maintenance conditions (temperature, humidity, food).
Additional examinations are often necessary: x-rays to visualize the condition of the lungs, sampling of respiratory secretions to identify the germ in question, and sometimes blood tests to assess the general condition of the animal.
These examinations make it possible to guide treatment and assess the severity of the lung damage.
Treatment
Treatment is based on antibiotic therapy adapted to the identified germ, associated if necessary with supportive care: rehydration, immediate correction of the temperature and humidity conditions of the terrarium, and sometimes nutritional assistance if the iguana is no longer eating.
In severe cases, hospitalization with oxygen therapy may be necessary. Correction of breeding conditions is essential alongside medical treatment, otherwise recovery is compromised.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention is based above all on good management of the terrarium: maintaining an appropriate temperature with a thermal gradient, correct humidity, good ventilation without cold drafts, and regular hygiene of the tank and accessories.
It is recommended to avoid unnecessary stress, provide a balanced and species-appropriate diet, and quarantine any new animal before integrating it into an existing group.
A regular veterinary check-up, even in the absence of symptoms, allows an emerging respiratory problem to be detected early.
Possible complications
Without treatment, pneumonia can progress to severe respiratory failure and the death of the animal. Generalized infection of other organs is also possible in a very weakened animal.
Poorly treated pneumonia can also become chronic, with frequent relapses if the breeding conditions are not permanently corrected.
When to see a veterinarian
The iguana breathes with its mouth open or with visible effort.
An abnormal noise (whistling, clicking) accompanies breathing.
The animal has refused to eat for several days.
A discharge appears from the nose or mouth.
The iguana is abnormally depressed or remains prostrate.
Prognosis
The prognosis depends on the precocity of treatment. Detected early and combined with correction of living conditions, pneumonia can be completely cured.
On the other hand, if the diagnosis is late or if the breeding conditions are not corrected, the prognosis becomes more guarded, with a risk of relapse or unfavorable evolution.
Frequently asked questions
Is iguana pneumonia contagious to other reptiles?
It can spread between iguanas living in the same poorly maintained terrarium, because the same conditions favor infection in all exposed animals. Quarantining the sick animal is recommended as a precaution.
Can you treat iguana pneumonia without going to the vet?
No. Only a veterinarian can identify the germ in question and prescribe appropriate treatment. Without targeted antibiotic therapy, the infection can quickly worsen and put the animal's life at risk.
How do I know if my iguana is having trouble breathing?
Signs include open-mouthed breathing, unusual noises, leaning up to breathe easier, and general depression. These signs warrant rapid consultation.
Can terrarium temperature really cause pneumonia?
Yes, indirectly. Unsuitable temperature weakens the iguana's immune system, allowing normally harmless bacteria to cause a lung infection.
References
AVMA — American Veterinary Medical Association
Content reviewed by the TunisieVet editorial team · Updated 27 September 2026
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