Ball pythons (Python regius) are the most commonly kept pet snake in the US. They are hardy when housed correctly, but a handful of conditions account for the majority of vet visits.
This guide walks through the diseases reptile vets see most often, what causes them, and when to seek care. Husbandry is the through-line — most ball python illness traces back to temperature, humidity, or hygiene.
The First Step Is Always a Husbandry Review
Per the ARAV reptile husbandry guidance (2024), an exotic vet evaluating a sick ball python will begin by asking about enclosure setup before running any tests.
Baseline parameters for a healthy ball python:
- Ambient temperature: 78-82°F
- Basking spot: 88-92°F
- Cool side: 75-78°F
- Humidity: 55-65% (raised to 70%+ during shedding)
- Substrate: cypress mulch, coconut husk, or paper
- UVB: low-level UVB recommended but not strictly required
If any of these are off, the underlying illness may be a secondary effect of poor husbandry rather than an isolated infection.
Respiratory Infections
Respiratory infections (RI) are one of the most common ball python presentations.
Signs
- Open-mouth breathing
- Wheezing or clicking sounds
- Mucus or bubbles at the nares
- Lethargy and reduced appetite
- Held in an elevated head posture to clear the airway
Causes
Per the Veterinary Information Network reptile respiratory overview (2023), the most common pathogens are gram-negative bacteria (Pseudomonas, Aeromonas, Klebsiella), often secondary to environmental stress.
Cold ambient temperature is the single most common trigger. A snake kept below the recommended thermal range cannot mount an effective immune response.
Treatment
A reptile vet will typically run a CBC, oral or tracheal culture, and sometimes radiographs to assess lung involvement. Treatment usually includes:
- Systemic antibiotics (ceftazidime, enrofloxacin) dosed by weight
- Correction of husbandry (raise ambient, raise basking)
- Supportive fluids and assisted feeding if anorexic
Mild RI caught early often resolves in 2-4 weeks. Advanced pneumonia carries a guarded prognosis.
Dysecdysis (Incomplete Shed)
Ball pythons should shed in one piece. A retained shed indicates an environmental or health problem.
Common Patterns
- Retained spectacles (eye caps) — the most common
- Retained tail tip — can cause constriction and necrosis
- Patchy retained skin
Causes
Per the AAV/ARAV joint husbandry summary (2024), incomplete shedding is almost always a humidity issue. A ball python in 40% humidity will struggle to shed; the same snake in 65% humidity sheds cleanly.
Other contributors include dehydration, parasites, scarring, and underlying systemic illness.
When to See a Vet
Retained eye caps left in place across multiple shed cycles can damage the cornea. A retained tail tip can constrict and require surgical removal if not addressed.
A vet will soak the snake, remove the retained skin carefully, and check for any underlying skin or eye damage.
Scale Rot (Bacterial Dermatitis)
Scale rot is a bacterial skin infection that progresses quickly in damp, dirty enclosures.
Signs
- Discolored ventral scales (yellow, brown, or red-tinged)
- Blistering on the belly
- Sloughing scales
- Pungent odor in severe cases
Cause
Per the ARAV reptile dermatology summary (2024), the primary cause is prolonged contact with damp, soiled substrate. The skin barrier breaks down and opportunistic bacteria invade.
Treatment
Mild cases resolve with husbandry correction and topical antiseptic (dilute chlorhexidine soaks). Moderate to severe cases require:
- Systemic antibiotics based on culture
- Daily wound care
- Clean dry housing on paper substrate during treatment
- Pain management for ulcerated lesions
Recovery takes weeks. Scarring is common after severe cases.
Mites
Snake mites (Ophionyssus natricis) are tiny external parasites that feed on blood. They are a common problem in newly acquired snakes and can spread between enclosures.
Signs
- Small black or red dots on the snake (visible on light scales)
- Snake soaking constantly in the water bowl
- Mites visible on a white paper towel after handling
- Lethargy and anemia in heavy infestations
Why They Matter
Per the VIN reptile parasitology review (2023), mites both cause direct harm and act as vectors for bacterial pathogens, particularly Aeromonas. A mite-infested snake is at high risk of secondary infection.
Treatment
Treatment requires both the snake and the enclosure.
- Snake: ivermectin (oral or topical) or fipronil spray applied to a cloth and wiped on (not sprayed directly)
- Enclosure: full tear-down, replace substrate, treat hide boxes, repeat in 7-10 days to catch new hatches
- Quarantine any newly acquired snakes for a minimum of 90 days
A reptile vet can confirm diagnosis, prescribe the right dose, and check for secondary infection.
Inclusion Body Disease (IBD)
IBD is a fatal disease primarily of pythons and boas.
Cause
Per the PMC reptarenavirus and IBD review (2023), IBD is associated with reptarenavirus infection. The disease produces characteristic intracytoplasmic inclusion bodies in many tissues.
Signs
- Regurgitation (often the first sign in pythons)
- Star-gazing posture or other neurological signs
- Inability to right itself
- Chronic respiratory infection
Diagnosis and Prognosis
Diagnosis requires biopsy showing the characteristic inclusions, or PCR for reptarenavirus. There is no effective treatment. Per the ARAV position statement on IBD (2024), euthanasia is recommended for confirmed cases to prevent transmission to other snakes.
Strict quarantine of new acquisitions is the only effective prevention.
Anorexia
Ball pythons are notorious for refusing food. Most refusals are behavioral and not medical.
Common Behavioral Causes
- Breeding season (males in particular, fall through spring)
- Recent move or enclosure change
- Pre-shed
- Cold ambient temperature
- Wrong prey size or type
When It Becomes Medical
A healthy adult ball python can refuse food for weeks or months without harm. Concern rises when:
- Significant weight loss (>10% of body weight)
- Visible spinal prominence or sunken sides
- Anorexia combined with lethargy, regurgitation, or respiratory signs
- A juvenile under 300g refusing for more than 4-6 weeks
A vet will check weight, body condition, and run baseline diagnostics to rule out underlying disease before declaring it behavioral.
Regurgitation
Regurgitation is always abnormal in a ball python and warrants a vet visit.
Common Causes
- Handling within 48 hours of feeding
- Prey too large
- Ambient temperature too cold for digestion
- Infection (especially cryptosporidiosis)
- IBD (regurgitation is often the first sign)
Cryptosporidiosis
Per the VIN reptile crypto overview (2023), Cryptosporidium serpentis is a leading infectious cause of chronic regurgitation in snakes. Diagnosis is by fecal PCR. There is no reliable cure — management is supportive and culling is sometimes recommended in collections.
Internal Parasites
Ball pythons can carry several internal parasites, particularly wild-caught individuals (now rare in the US trade) and animals from poor breeding setups.
Common Parasites
- Roundworms
- Pinworms
- Coccidia
- Cryptosporidium (see above)
Diagnosis
A fecal exam is the standard screen. Per the AAV parasitology recommendations (2024), a baseline fecal during the new-snake quarantine vet visit catches most infestations before they affect the snake.
Treatment varies by parasite — fenbendazole and ponazuril are common for the standard panel.
Trauma and Bite Wounds
Live-prey feeding is the most preventable cause of trauma in ball pythons. A rat left in the enclosure with an inattentive snake can cause severe bite wounds.
Per the ARAV feeding recommendations (2024), pre-killed or frozen-thawed prey is the recommended standard. The shift from live to frozen-thawed has reduced bite-trauma presentations significantly.
For any bite wound, see a vet — even superficial wounds become infected without treatment.
What an Exotic Vet Will Do
A standard ball python vet visit includes:
- Husbandry interview (substrate, temperature, humidity, feeding schedule)
- Weight and body condition
- Visual exam (skin, oral cavity, vent, eyes)
- Palpation
- Fecal exam if recent stool available
- Bloodwork if systemic disease is suspected
- Radiographs for respiratory or GI presentations
Per the ABVP reptile and amphibian practice scope (2025), a board-certified reptile and amphibian practitioner is the highest credential for snake care. Find one via the ABVP find-a-diplomate tool.
Frequently Asked Questions
How often should a healthy ball python see a vet?
An annual wellness exam with a fecal is the standard recommendation. Per the AAV/ARAV wellness recommendations (2024), this baseline catches parasites and developing issues before they become emergencies.
A new snake should see a vet within 30 days of acquisition.
Can I treat a respiratory infection at home?
No. Respiratory infections in snakes require culture-guided antibiotics. Over-the-counter remedies do not work and delay effective treatment.
You can support the snake at home by raising the ambient temperature and humidity while waiting for the appointment.
Why is my ball python not eating?
Most refusals are behavioral — breeding season, pre-shed, environmental stress, or seasonal cycles. Healthy adult ball pythons routinely fast for weeks without harm.
See a vet if there is weight loss, visible body condition decline, or other clinical signs alongside the anorexia.
How do I know if my snake has mites?
Place the snake on a wet white paper towel for 10 minutes. Mites will leave the snake to escape the moisture and appear as tiny moving black or red dots on the towel.
A reptile vet can confirm diagnosis and prescribe appropriate treatment.
Is IBD contagious to other snakes?
Yes. Per the ARAV IBD position statement (2024), reptarenavirus spreads between snakes via direct contact, shared equipment, and possibly mites. Strict quarantine of new acquisitions for 90 days minimum is the standard prevention.
Related Reading
- Herpetological Medicine for Reptile Owners
- Finding a Reptile Vet Near You
- ARAV Reptile Veterinarian Association Overview
-- The Exotic Vet Finder Team