Iguana

How To Know If My Iguana Is Sick

Max. D Gray
By Max. D Gray. Updated: August 27, 2025
How To Know If My Iguana Is Sick
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More and more people have opted for keeping exotic animals as a pet. People are generally more accustomed to living with mammals such as dogs and cats than reptiles such as iguanas, making it difficult for us to interpret their behaviour and detect symptoms of disease. Iguanas are not the most expressive animals, so sometimes it might be difficult to know their mood. Furthermore, these animals tend to hide their signs of illness as a defensive trick, which adds even more difficulty to the task.

In OneHowTo.com we are aware of this fact and so we explain how to tell if an iguana is sick.

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Contents
  1. Behaviour
  2. Anorexia
  3. Limbs
  4. Parasites
  5. Droppings
  6. Breathing
  7. Twitching
  8. Loss of balance

Behaviour

The best way to know if your iguana is sick is to become familiar with its normal behaviour. By observing your pet regularly, you can establish a baseline of what is typical for your iguana.

Although iguanas are not excessively active animals, if you have noticed that your iguana is calmer and quieter than usual, you should keep an eye on it, as lethargy is a common symptom of many diseases. Lethargy could also indicate dehydration or malnutrition, both of which require immediate attention.

Moreover, a sudden increase in aggressiveness can be caused by disease, stress, or environmental changes. An iguana that suddenly becomes aggressive might be experiencing discomfort or pain, prompting it to react defensively.

Anorexia

The most common causes that make an iguana lose its appetite are stress, excessive temperature, change in diet, or inadequate nutrition. Stress can be triggered by a change in environment, such as a new habitat setup or the presence of other animals.

If you have ruled out these factors and your iguana still does not eat, then it is likely sick. A persistent lack of appetite may also hint at internal issues such as organ dysfunction or parasitic infections. Consulting a vet can help determine if there are underlying health problems.

How To Know If My Iguana Is Sick - Anorexia

Limbs

Joint inflammation is usually caused by gout, and inadequate food may be responsible for this. Foods high in protein and low in calcium can contribute to this painful condition.

Similarly, food disorders together with an inadequate supply of ultraviolet radiation can cause metabolic bone disease. In these cases, we will see swelling in the hind legs, deformed fingers, and, in extreme cases, paralysis. Iguanas require a balanced diet rich in calcium and exposure to UVB lighting to maintain healthy bones.

Also, a lack of vitamins in itself can cause paralysis, highlighting the importance of a diet that meets all nutritional needs.

Parasites

Sometimes external parasites, such as ticks and mites, can be observed. These parasites can cause skin irritation and discomfort, leading to excessive scratching or shedding.

These can be difficult to see at a glance, though sometimes their droppings can look a bit like 'dust'. Regular cleaning and checking of your iguana's habitat can help prevent infestations.

In addition, there are Internal parasites that are capable of causing vomiting and diarrhoea. These conditions can lead to dehydration and nutritional deficiencies if not treated promptly.

Iguanas rarely vomit; therefore, doing so might be a clear sign of illness. Prompt veterinary intervention is advisable to address these issues effectively.

Droppings

Both diarrhoea and constipation are signs of disease. Changes in diet, hydration levels, or the presence of parasites can affect the consistency of droppings.

Sometimes changes in temperature can cause the stools to be more liquid than normal, but if this situation persists, you should consult a veterinarian. Persistent diarrhoea can lead to dehydration, while constipation might be linked to dietary imbalances or blockages.

You should keep an eye on your iguana's feces to see if there is any change in color, volume, or consistency. These changes can provide valuable insights into your pet's overall health.

How To Know If My Iguana Is Sick - Droppings

Breathing

Healthy iguanas breathe with their mouth closed. If you have seen your iguana breathe with its mouth open, it may be suffering from a respiratory disease. Open-mouth breathing can indicate distress or respiratory infection.

Their nostrils should also be checked in search of mucus. Excessive mucus can be a symptom of respiratory infections, which may require antibiotics or other veterinary treatments to resolve.

Twitching

Healthy iguanas don't usually twitch, so if your pet is twitching, it might be a sign that something is wrong. Twitching can be related to neurological issues, electrolyte imbalances, or toxicity.

If you notice persistent twitching, it is important to assess your iguana's environment and diet to ensure it is not exposed to harmful substances or conditions.

Loss of balance

If your iguana seems to be unable to stand on four feet, it might be because the temperature is too cold. Iguanas are ectothermic and rely on external heat sources to regulate their body temperature.

Restore the temperature, but if it still struggles to keep balance, check with a vet. Loss of balance can also indicate neurological issues or severe physical distress, necessitating professional evaluation.

If you want to read similar articles to How To Know If My Iguana Is Sick, we recommend you visit our Pets category.

Tips

  • We recommend you to take your iguana to the veterinarian at least twice a year. Regular check-ups can help catch potential health issues early and ensure that your iguana is receiving the proper care.
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1 comment
Anna Picket
So if my iguana sits around with its mouth open, just breathing, that's a bad sign. That would be bad if he got a "respiratory disease." It may seep obvious, but I hadn't realized that iguanas could get colds. maybe we should find a vet that knows how to treat exotic animals.
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How To Know If My Iguana Is Sick