Why Early Detection Is Everything in Reptile Health
Reptiles are masters at hiding illness. In the wild, a sick animal is a target — so evolution has programmed them to act normal for as long as physically possible. By the time a reptile looks sick, it's often been sick for weeks. This is why experienced keepers don't wait for obvious symptoms. They watch for subtle changes in behavior, appetite, and appearance — the quiet signals that something might be off.
I've been keeping reptiles for over a decade now, and the single most valuable habit I've developed is just paying attention. Spending five minutes each day observing your reptile — how it moves, how it eats, what its droppings look like — gives you a baseline. When something changes, you'll notice it quickly, and that early catch can make the difference between a simple treatment and a life-threatening crisis.
Let's go through the most common health issues in pet reptiles, how to spot them, and what to do about them.
Metabolic Bone Disease (MBD)
MBD is probably the most common serious health issue in captive reptiles, and it's almost entirely preventable. It's caused by inadequate calcium, insufficient vitamin D3, or both — usually due to poor UVB lighting and/or lack of calcium supplementation.
Signs to Watch For
- Softening or flexibility in the jaw (you can feel it gently flex when it should be rigid)
- Swollen or bowed limbs
- Difficulty walking or dragging the body
- Tremors or muscle twitching
- Kinked tail or spine
- Reluctance to move or climb
- Rubber jaw — the lower jaw feels soft and pliable
What to Do
See a reptile vet immediately. Early-stage MBD can be reversed with calcium injections, oral calcium, and correcting the UVB and supplementation routine. Advanced MBD causes permanent skeletal deformity and can be fatal.
Prevention: proper UVB lighting (appropriate for your species), calcium dusting on every insect feeding, and a multivitamin supplement weekly.
Respiratory Infections
Respiratory infections (RIs) are bacterial, viral, or fungal infections of the lungs and airways. They're common in species kept at incorrect temperatures or with inappropriate humidity and ventilation.
Signs to Watch For
- Wheezing or clicking sounds when breathing
- Open-mouth breathing (reptiles normally breathe with their mouth closed)
- Mucus or bubbles around the nostrils or mouth
- Excess saliva or stringy mucus in the mouth
- Puffing up the throat or body while breathing (labored breathing)
- Decreased appetite and lethargy
- Tilting the head to one side (in severe cases, if the infection spreads to the inner ear)
What to Do
First, check your husbandry. Low temperatures are the most common trigger — if your reptile's enclosure is too cold, its immune system can't fight off infections effectively. Raise temperatures to the correct range for your species. Ensure humidity and ventilation are appropriate (high humidity without airflow is a breeding ground for bacteria).
Then see a reptile vet. RIs typically require antibiotic treatment. Delaying treatment allows the infection to worsen, and advanced respiratory infections can be fatal.
Parasites
Both internal and external parasites are common in reptiles, especially in wild-caught or pet-store animals that haven't been properly quarantined.
Internal Parasites
Common types: Pinworms, coccidia, flagellates, roundworms, and Cryptosporidium.
Signs: Weight loss despite normal appetite, runny or foul-smelling stools, visible worms in feces, bloating, regurgitation, and failure to thrive (especially in young animals).
Many reptiles carry low levels of internal parasites without showing symptoms. Stress, poor husbandry, or immune suppression can allow parasite populations to explode. A fecal test from a reptile vet is the only way to diagnose internal parasites accurately.
Cryptosporidium deserves special mention — it's a serious parasitic infection particularly devastating in leopard geckos ("stick tail disease"). It causes chronic wasting, and there's currently no reliable cure. Quarantine all new reptiles and get fecal tests before housing them near your existing collection.
External Parasites (Mites)
Signs: Tiny black or red dots moving on the skin, especially around the eyes, heat pits (in snakes), and under scales. You may see them floating in the water bowl. The reptile may soak excessively, rub against surfaces, and show increased restlessness.
What to do: Treat the reptile with reptile-safe mite treatment (like a lukewarm soak with a drop of dawn dish soap for immediate relief, then follow up with veterinary-recommended treatments). Completely strip and disinfect the entire enclosure. Mites reproduce quickly and can infest an entire collection if not dealt with aggressively. Consult your vet for a treatment plan.
Mouth Rot (Infectious Stomatitis)
Mouth rot is a bacterial infection of the mouth and gums. It's often secondary to an injury (from live prey, rough handling, or rubbing on enclosure walls) or a weakened immune system from poor husbandry.
Signs
- Redness, swelling, or discoloration of the gums
- Cottage-cheese-like yellow or white patches inside the mouth
- Excess mucus or pus in the mouth
- Difficulty eating or refusal to eat
- Swelling around the jaw or face
What to Do
Veterinary treatment is essential. Mouth rot requires cleaning the infected tissue and usually a course of antibiotics. Left untreated, the infection can spread to the jawbone and become life-threatening. In the meantime, ensure temperatures are in the correct range — warmth supports the immune system's ability to fight infection.
Dysecdysis (Shedding Problems)
While we cover this in detail in our shedding guide, chronic shedding problems deserve mention as a health issue because they often signal an underlying problem. Occasional stuck shed is usually a humidity issue. Chronic, repeated bad sheds despite correct humidity may indicate:
- Dehydration
- Parasitic infection
- Nutritional deficiency (especially vitamin A)
- Thyroid dysfunction
- Skin infection
If you've optimized humidity and your reptile is still shedding poorly, get a vet checkup.
Egg Binding (Dystocia)
Female reptiles can produce eggs even without a male present (unfertilized eggs). If a female is unable to pass her eggs, this is called egg binding — and it's a medical emergency.
Signs
- Visible swelling in the abdomen
- Restlessness, digging behavior (trying to find a nesting site)
- Loss of appetite
- Lethargy, especially after a period of restlessness
- Straining without producing eggs
What to Do
Ensure the female has an appropriate lay box — a container filled with moist soil or vermiculite where she can dig and deposit eggs. Many cases of egg binding occur simply because the reptile has nowhere suitable to lay. If she has access to a lay box and still can't pass her eggs after 24-48 hours of visible effort, see a vet immediately. Egg binding can be fatal if the eggs rupture internally or cause a blockage.
Thermal Burns
Burns are depressingly common and almost always caused by keeper error — usually an unregulated heat source.
Common Causes
- Heat mats without thermostats
- Heat rocks (which should never be used)
- Basking bulbs without proper guards or distance
- Direct contact with ceramic heat emitters
Signs
Blistering, discoloration, or charring of the scales on the belly (from below-heat sources) or back (from overhead sources). The reptile may not show pain immediately — they don't always move away from heat fast enough to prevent injury.
What to Do
Remove the heat source causing the burn. Keep the wound clean and dry. See a reptile vet — burns easily become infected and may require antibiotics and wound management. Then fix your setup: every heat source must be controlled by a thermostat, and direct contact with heating elements must be impossible.
Impaction
Impaction is a blockage in the digestive tract, most commonly caused by ingesting substrate (sand, gravel, bark) or prey items that are too large.
Signs
- Loss of appetite
- Swollen abdomen that feels firm
- No bowel movements for an extended period
- Lethargy
- Straining to defecate
- Dark spot visible on the belly (in lighter-colored species)
What to Do
For mild cases: a warm soak (15-20 minutes in lukewarm water) and gentle belly massage can sometimes help. Make sure temperatures are adequate — cold reptiles can't digest properly, which contributes to impaction. If the reptile doesn't pass the blockage within 24-48 hours, or if symptoms are severe, see a vet. Severe impaction may require surgery.
Prevention: Use safe substrates, feed appropriately sized prey, and maintain proper basking temperatures for digestion.
Building a Relationship With a Reptile Vet
I'll end with this: find a reptile vet before you need one. Not all veterinarians treat reptiles — you need an exotics vet or a vet with specific reptile experience. The Association of Reptilian and Amphibian Veterinarians (ARAV) has a find-a-vet tool on their website.
Schedule a wellness check within the first week of getting a new reptile. Bring a fresh fecal sample for parasite testing. This establishes a baseline and gives you a vet who already knows your animal if an emergency arises. Trying to find a qualified reptile vet at 10 p.m. on a Saturday when your snake is wheezing is not a fun experience — trust me on that one.