# My Tortoise Has a Runny Nose: Causes and When to Worry A runny nose in a tortoise usually means something is irritating or infecting the nasal passages, and in many cases it is an early sign of respiratory disease. A small amount of clear moisture can be normal, but thick, colored, or persistent discharge is not. If my tortoise has a runny nose, I treat it as a reason to check the enclosure and call a veterinarian who sees reptiles. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Clear, occasional bubbles after a soak or a drink can be normal. Thick, cloudy, yellow, or green discharge is not. - The most common serious cause is an upper respiratory tract infection, often involving Mycoplasma bacteria in tortoises [1]. - A runny nose paired with open-mouth breathing, wheezing, or a clicking sound is urgent. - Do not use leftover or human antibiotics. A veterinarian calculates the right drug and dose from your tortoise's weight and health. - Fix the enclosure first. Cold, damp, or drafty housing keeps nasal problems coming back. ## What a Runny Nose Looks Like in a Tortoise ### Normal moisture versus real discharge Tortoises sometimes produce a little clear fluid from the nostrils. You may see a bubble or two after a bath, after drinking, or when the tortoise has been in warm, humid air. That fluid is thin, clear, and gone within minutes. Real discharge looks different. It may be thick, stringy, cloudy, or colored. It may dry into a crust around the nostrils or on the front legs if your tortoise wipes its face. It keeps coming back. The tortoise may also rub its nose, sneeze, or hold its head out and up. ### Other signs that often come with it A runny nose rarely travels alone. Watch for: - Wheezing, whistling, or a clicking sound when breathing - Open-mouth breathing - Stretching the neck out to breathe - Loss of appetite - Lethargy or staying hidden more than usual - Swollen or watery eyes - Weight loss - A soft or sunken shell in severe cases These signs point toward the lower airways, not just the nose. That is a bigger problem. ## Main Causes of a Runny Nose in Tortoises | Cause | Typical clues | How urgent | |---|---|---| | Upper respiratory infection (Mycoplasma) | Chronic clear to cloudy discharge, wheezing, appetite loss, often after a stressful move or cold spell | See a vet soon. This can spread to other tortoises [1] | | Poor husbandry (cold, damp, drafty enclosure) | Discharge appears after a temperature drop, no other signs at first | Fix housing now, vet visit if it lasts more than a few days | | Nasal irritation (dust, substrate, chlorine) | Clear discharge, sneezing, starts after a bedding or water change | Remove the irritant, monitor closely | | Bacterial infection with other pathogens | Colored discharge, lethargy, poor appetite, may follow a viral illness | See a vet soon | | Abscess or foreign material in the nostril | Discharge from one side only, swelling, pawing at the face | See a vet soon | | Serious systemic infection | Bleeding from the nose, pale gums, bruising, extreme weakness | Emergency now [2] | ### Upper respiratory infection This is the cause most owners end up dealing with. In tortoises, Mycoplasma agassizii is a well-known pathogen of the upper respiratory tract, and it is a real concern when tortoises are moved between groups [1]. A study of Texas tortoises found that infected animals were treated with danofloxacin at 6 mg/kg injected under the skin every other day for 30 days [1]. That dose came from a specific field program, so do not copy it at home. Your veterinarian will decide the drug, the dose, and the length of treatment based on your tortoise. Nasal bacteria in tortoises are diverse, and the mix differs between species and locations [3]. One bacterium, Pasteurella testudinis, is common and abundant in tortoise noses, but its presence alone does not explain why some tortoises have discharge and others do not [3]. What the data do show is that tortoises with nasal discharge at the time of sampling had less diverse nasal bacterial communities and a different community makeup [3]. In plain terms, discharge tends to come with a shift in the normal nasal bacteria, not just one bad bug. ### Husbandry problems Many runny noses start with the enclosure. Tortoises are ectotherms. They rely on their environment to regulate body temperature and immune function. A basking spot that is too cool, a night temperature that drops too low, constant dampness, or a drafty spot can all trigger nasal signs. Correct these and mild cases often settle. ### Irritants Dusty substrate, cedar or pine shavings, strong cleaning fumes, and chlorinated water can irritate the nasal lining. So can a dry enclosure with low humidity for species that need more moisture. The discharge here is usually clear and starts right after a change. ### Other infections Respiratory disease in reptiles is often mixed. In snakes, mycoplasmas, serpentoviruses, and Chlamydia species have been found together in animals with and without respiratory signs [4]. A similar principle applies to tortoises. A virus can damage the airway lining and let bacteria move in. Adenoviruses and paramyxoviruses have been detected in reptiles with signs that include runny nose [5]. A veterinarian may test for more than one agent. ### Rare but severe causes Mycobacteriosis is usually a chronic disease in reptiles, but it can present acutely. One turtle with acute mycobacteriosis had hemorrhagic nasal discharge, pale mucous membranes, and bleeding spots on the limbs, and it was euthanized because of the severity [2]. This is uncommon, but it shows why bloody or sudden severe discharge needs immediate care. If you keep other pets, some nasal signs overlap with common problems in mammals. You can read about [why a cat sneezes so much with a runny nose](/knowledge/veterinary-medicine/clinical-methods/why-is-my-cat-sneezing-so-much-and-has-a-runny-nose) and [cat sneezing causes](/knowledge/veterinary-medicine/online-vet-and-care-costs/cat-sneezing-causes) for comparison, but do not apply mammal treatments to a tortoise. ## Red Flags That Make It an Emergency Call an exotic or reptile veterinarian right away if you see any of these: - Open-mouth breathing at rest - Wheezing, gasping, or a clicking sound with every breath - Blood or bloody fluid from the nostrils [2] - Pale gums or tongue, bruising, or bleeding spots on the skin [2] - Complete refusal to eat for more than a few days - Extreme weakness, a tortoise that cannot lift its head - Sudden collapse or unresponsiveness - Discharge that gets worse despite correct temperatures A tortoise that is breathing hard and cannot get air is in trouble. Do not wait for a weekday appointment. ## Tortoise Breathing Heavy: What It Can Mean Heavy breathing is not the same as a runny nose, but the two often travel together. A tortoise may breathe hard because of pain, heat stress, a respiratory infection, or fluid in the airways. Some tortoises also breathe visibly when they are frightened or when they have been handled. Watch the pattern. Normal breathing is slow and quiet. Heavy breathing that continues at rest, comes with a stretched-out neck, or shows up with nasal discharge points to disease. If your tortoise is breathing hard and also has a runny nose, treat it as a respiratory case and get it seen. For a broader look at how these infections behave in reptiles, see [reptile respiratory infections](/knowledge/veterinary-medicine/reptile-care/reptile-respiratory-infections-causes-symptoms-treatment). ## Safe Things You Can Do at Home While Waiting You cannot cure a respiratory infection at home. You can keep your tortoise stable until the appointment. ### Check and correct temperatures Measure the basking spot, the warm end, the cool end, and the night temperature with a reliable thermometer. Match the range to your species. Most common pet tortoises need a warm basking zone and a cooler retreat. Fix any gap before you do anything else. ### Reduce humidity problems If the enclosure is soaked, dry it out and improve drainage. If it is bone dry and your species needs humidity, add a humid hide instead of flooding the whole cage. Damp plus cold is the worst combination for the airway. ### Remove irritants Swap dusty or aromatic bedding for a safe substrate. Rinse and air the enclosure if you used strong cleaners. Offer fresh, dechlorinated water. ### Keep the tortoise warm and quiet Isolate the tortoise from others. Reduce handling. Offer food it normally likes, and keep a shallow water dish available. ### Do not medicate on your own Never give antibiotics meant for people, dogs, cats, or fish. The wrong drug does nothing, and the wrong dose can harm your tortoise. A veterinarian calculates the dose from your pet's weight and health. Do not use leftover medication from a previous illness either. ### Track the signs Write down when the discharge started, what it looks like, how much the tortoise is eating, and whether breathing sounds change. Photos and short videos help your veterinarian. ## What Your Veterinarian Will Check and Test ### History and husbandry review Expect questions about temperatures, humidity, substrate, diet, water, and any new tortoises. Husbandry is part of the diagnosis, not a side note. ### Physical exam The veterinarian will check the nostrils, mouth, eyes, and breathing. They will listen to the airways, check the shell, and assess body condition and hydration. They may look for swelling around the face or one-sided discharge that suggests a foreign body or abscess. ### Diagnostic tests Depending on the exam, your veterinarian may recommend: - Nasal or oral swabs for bacterial culture and PCR testing - Blood work to check organ function and infection markers - Imaging such as radiographs to look at the lungs - Testing for Mycoplasma species, which are known respiratory pathogens in tortoises [1] - Testing for viruses and other bacteria, since mixed infections are common in reptiles [4] ### Treatment Treatment depends on the cause. Bacterial infections need antibiotics chosen for the specific organism. Mycoplasma infections can be stubborn and often need a long course. In one field program, infected Texas tortoises received danofloxacin at 6 mg/kg under the skin every other day for 30 days [1]. Your veterinarian will set the plan for your tortoise. Supportive care matters too, including warmth, fluids, and nutrition. ## Prevention and Monitoring ### Quarantine new tortoises Keep any new tortoise separate for at least several months. Have it checked by a veterinarian before it meets your resident animals. Mycoplasma can spread within a group, which is why disease status is checked before tortoises are moved between sites [1]. ### Keep records Track weights monthly, note appetite, and photograph any discharge. Early changes are easier to spot against a baseline. ### Clean and disinfect Remove waste daily. Clean water and food dishes often. Wash your hands between handling different animals. ### Watch the group If one tortoise has a runny nose, check the others. Nasal discharge in a tortoise is linked to a shift in the nasal bacterial community, so a group problem can show up one animal at a time [3]. ### Know your species Desert species and tropical species need different humidity and temperatures. Set the enclosure for your species, not for tortoises in general. ## Limitations and When to Contact a Veterinarian This article cannot tell you what is causing your tortoise's runny nose. Only a veterinarian who examines your animal can do that. Individual cases need a veterinarian, and the timing matters. Contact a veterinarian the same day if your tortoise has colored or thick discharge, has stopped eating, is wheezing, or has been losing weight. Go to an emergency clinic now if your tortoise is open-mouth breathing, gasping, bleeding from the nose, pale, bruised, collapsed, or unresponsive [2]. Schedule a routine visit if the discharge is clear but has lasted more than a few days, if it keeps returning, or if you recently added a new tortoise to your collection. If you are unsure, call. A short phone call is cheaper than a late-stage infection. ## Frequently Asked Questions ### Is a runny nose in a tortoise always an infection? No. Clear, brief moisture after a soak or drink can be normal. Thick, colored, or repeated discharge is more likely to be infection or irritation. A veterinarian can tell the difference with an exam and testing. ### Can I treat my tortoise's runny nose at home? You can correct temperatures, humidity, and irritants at home, and that may help mild cases. You cannot safely treat a bacterial infection without a prescription. Never give antibiotics without veterinary guidance, because the wrong drug or dose can cause harm. ### How do I know if my tortoise is breathing heavy or just moving? Normal breathing is slow and quiet, even when the tortoise walks. Heavy breathing that continues at rest, comes with a stretched neck, or includes noise is not normal. Pair it with a runny nose and you should call your veterinarian. ### Will my other tortoises get sick? They can. Respiratory pathogens such as Mycoplasma spread within tortoise groups, which is why testing and quarantine matter before animals are mixed [1]. Isolate the affected tortoise and have the others checked if signs appear. ### What should I bring to the appointment? Bring photos or videos of the discharge and breathing, your temperature and humidity readings, a description of the diet and substrate, and a list of any other animals in the enclosure. If you can, bring a fresh stool sample. This information helps your veterinarian choose the right tests and treatment. ## Related Articles - [Reptile Respiratory Infections: Causes, Symptoms, and Treatment](/knowledge/veterinary-medicine/reptile-care/reptile-respiratory-infections-causes-symptoms-treatment) - [Why Is My Tortoise Wheezing? Respiratory Signs to Watch](/knowledge/veterinary-medicine/reptile-care/tortoise-wheezing-respiratory) - [Why Is My Tortoise Lethargic? Causes and When to Worry](/knowledge/veterinary-medicine/reptile-care/tortoise-lethargic-causes) - [Why Is My Tortoise Crying? Eye Discharge Causes](/knowledge/veterinary-medicine/reptile-care/tortoise-crying-eye-discharge) - [Turtle Herpesviruses](/knowledge/viruses/wildlife-viruses/turtle-herpesviruses) ## References 1. [Surveillance of Mycoplasma agassizii in Texas tortoises (Gopherus berlandieri) for translocation with emphasis on treatment and recovery](https://pubmed.ncbi.nlm.nih.gov/39897159/). Frontiers in veterinary science, 2024. 2. [Sepsis and disseminated intravascular coagulation in an eastern spiny softshell turtle (Apalone spinifera spinifera) with acute mycobacteriosis](https://pubmed.ncbi.nlm.nih.gov/19746876/). Journal of zoo and wildlife medicine : official publication of the American Association of Zoo Veterinarians, 2009. 3. [Host species, pathogens and disease associated with divergent nasal microbial communities in tortoises](https://pubmed.ncbi.nlm.nih.gov/30473851/). Royal Society open science, 2018. 4. [Identifying Infectious Agents in Snakes (Boidae and Pythonidae) with and Without Respiratory Disease](https://pubmed.ncbi.nlm.nih.gov/40804977/). Animals : an open access journal from MDPI, 2025. 5. [Detection and phylogenetic analysis of a new adenoviral polymerase gene in reptiles in Korea](https://pubmed.ncbi.nlm.nih.gov/29460003/). Archives of virology, 2018. ## Further Reading - [Merck Veterinary Manual: Reptiles](https://www.merckvetmanual.com/all-other-pets/reptiles)