Why Is My Leopard Gecko Not Eating? 8 Causes + What to Do

The First Time Ziggy Stopped Eating

Ziggy is a two-year-old male leopard gecko — a normal morph, yellow with crisp black spots, built like he takes his meals seriously. He has eaten reliably every other day since I got him as a juvenile, has never refused a cricket in his life, and eats with the kind of focused intensity that makes you feel like an exceptional gecko parent.

So when he walked past three consecutive feeding attempts without even looking at the crickets, I did what most gecko owners do: I went straight down a spiral of forum posts and worst-case scenarios. Parasites. Impaction. Cryptosporidium. Metabolic bone disease. In the first week of Ziggy's food refusal I had mentally diagnosed him with everything.

What was actually happening was far simpler. It was late October, the day length had dropped noticeably, and Ziggy — a crepuscular desert reptile whose biology is tuned to seasonal light cycles — was going into a mild brumation. His tail was still fat. His droppings were normal when he had them. He just didn't want to eat for about five weeks, and then one November evening he ate four mealworms in a row and pretended nothing had happened.

That experience taught me the most important rule of leopard gecko ownership: food refusal is extremely common and has a very wide range of causes, from the completely normal to the genuinely urgent. You need to know which situation you're in — and you find that out by looking at the whole picture, not just the empty food bowl.

Why Leopard Geckos Can Fast Longer Than Most Pets

Leopard geckos evolved in the arid scrublands and rocky deserts of South Asia — Afghanistan, Pakistan, northwest India — where food availability varies enormously by season. To survive periods of low prey availability, they developed a fat storage system in their tail. That tail is not just aesthetically pleasing; it is a literal energy reserve that the gecko draws on during fasting periods.

This means a healthy adult leopard gecko with a fat tail can go two to four weeks without eating and remain completely fine. During brumation, some geckos fast for six to eight weeks without any health consequences. This is very different from a mammal in the same situation — and it means "my gecko hasn't eaten in two weeks" is not automatically an emergency the way it might be with a rabbit or a bird.

The caveat is this: the tail is how you know whether the fast is within the gecko's reserve capacity. A plump tail means the gecko is drawing on those reserves normally. A noticeably thinning tail means the fast has exceeded what the reserves can safely cover, and the gecko needs veterinary investigation regardless of the reason.

8 Reasons Your Leopard Gecko Has Stopped Eating

1. Brumation — the most common reason in autumn and winter

Brumation is the reptile equivalent of hibernation — a period of reduced metabolism, activity, and food intake triggered by decreasing day length. In leopard geckos, it typically begins in October or November and can last through February or March. The gecko becomes less active, hides more, sleeps longer, and stops eating with varying degrees of completeness. Some geckos slow down noticeably; others stop eating entirely for weeks.

Brumation is entirely normal and healthy for adult leopard geckos. It is driven by light cycles rather than temperature alone, so even a gecko kept at the correct temperature will enter brumation when natural day length shortens.

Signs this is what's happening: The refusal started in autumn or early winter. The gecko is still alert when handled but less active than usual. The tail remains plump. Droppings are infrequent but normal in appearance. There are no other symptoms.

What to do: Ensure fresh water is always available. Do not force-feed. Keep temperatures correct. You can offer food occasionally — once a week is fine — but do not worry if it's refused. The gecko will resume eating when the days lengthen. One important caveat: if your gecko has not had a recent faecal test for parasites, a vet visit before brumation is worth doing — a parasite-loaded gecko that fasts for months can deteriorate rapidly.

2. Pre-shed fasting

Leopard geckos shed their entire outer skin in one piece, and the process typically takes 24–72 hours from start to finish. In the days before a shed, many geckos lose interest in food entirely. The skin becomes dull and milky (particularly visible around the eyes), and the gecko may become more defensive or reclusive than usual.

Pre-shed fasting is completely normal and very short-lived. Once the shed is complete, appetite returns quickly — often within 24 hours.

What to check: Look for the characteristic dulling of the skin that precedes a shed. Check that humidity in the enclosure is adequate (a moist hide is essential for clean sheds — around 60–80% humidity in the moist hide). Retained shed — particularly around the toes or eyes — is a complication that does need attention, as it can restrict blood flow or cause eye infections. After a shed, check all toes and around both eyes for retained pieces of skin.

3. Incorrect temperature — the most common preventable cause

Leopard geckos are ectotherms — their body temperature, and therefore their entire metabolism including digestion, is controlled by their environment. If the enclosure temperature is too low, digestion slows or stops entirely, and eating becomes both unappealing and physiologically difficult. Food sitting undigested in the gut can cause serious problems.

The correct temperature gradient for a leopard gecko enclosure:

• Warm hide surface temperature: 30–32°C (86–90°F) — measured on the substrate in the warm hide, not air temperature
• Ambient warm side: 27–29°C (80–85°F)
• Cool side: 24–26°C (75–78°F)
• Night temperature: can drop to 20–22°C (68–72°F) — below 18°C (65°F) is too cold

The most reliable way to measure this is a digital thermometer with a probe placed at substrate level in the warm hide — not an ambient air thermometer, and not an infrared gun pointed at the glass. Under-tank heaters (UTH) connected to a thermostat are the recommended heat source for leopard geckos; overhead heat alone produces hot air but does not provide the belly warmth that leopard geckos use to thermoregulate and digest.

If temperatures are wrong: correct them before concluding the gecko is ill. A gecko that begins eating again within a few days of a temperature fix was not sick — it was cold.

4. Stress from a new environment or change

Leopard geckos moved to a new home typically need two to four weeks to settle before their feeding behaviour normalises. During this period many refuse food entirely — this is normal stress behaviour, not illness. The same response can be triggered by significant changes within an established enclosure: new decor, moving the enclosure to a different room, a new pet in the household that approaches or looks at the tank, change of substrate, or a change in feeding time or prey type.

A stressed gecko that is otherwise healthy will have a plump tail, normal posture, and no physical symptoms. They may be more defensive when handled — reaching into the hide and trying to pick them up is not recommended during this settling-in period. Leave them alone, maintain correct temperatures and fresh water, and offer food once every few days. Most geckos will begin eating within 2–4 weeks of arriving in a new home.

5. Breeding season — males especially

Male leopard geckos frequently go off food during the breeding season, which typically runs from late February through June. Testosterone levels increase significantly, and males often become restless, pace the enclosure more than usual, and show little to no interest in food for weeks at a time. This is a hormonal drive, not a health problem, and it resolves on its own as the breeding season ends.

Female leopard geckos may also go off food when gravid (carrying eggs), or may eat erratically through the egg-laying period. A gravid female will have a noticeably thickened abdomen and may dig or scratch at substrate more than usual.

6. Internal parasites

Parasites are one of the more serious causes of food refusal in leopard geckos, and they are common enough that any gecko acquired from a pet shop, breeder, or rescue that has not been recently tested should be assumed to have some level of parasite load. The main culprits:

• Pinworms: Very common, often considered commensal (living harmlessly in small numbers), but a heavy load can cause weight loss and reduced appetite
• Coccidia: Can cause diarrhoea, weight loss, and appetite loss; more serious in juveniles and immunocompromised adults
• Cryptosporidium (Crypto): The most serious. Cryptosporidiosis in leopard geckos is a progressive, often fatal illness characterised by "stick tail" — the tail loses mass rapidly from the base, giving a thin, bony appearance despite normal or increased eating in early stages. Later stages include complete food refusal, weight loss, and decline. Crypto is untreatable in reptiles and can survive on surfaces for months. It requires vet diagnosis.

Red flag: A gecko whose tail is thinning from the base despite having food available, or a gecko with persistent watery or abnormal droppings alongside food refusal, needs a faecal float test at a reptile vet. Do not delay this one.

7. Illness — MBD, respiratory infection, mouth rot

Several illnesses cause food refusal as a symptom alongside other signs:

• Metabolic Bone Disease (MBD): Caused by calcium and vitamin D3 deficiency — often the result of inadequate supplementation (calcium dusting of feeders and Vitamin D3 supplementation are both essential in captive geckos). A gecko with MBD may show tremors, soft or misshapen bones, difficulty walking, and reduced appetite. Correcting diet and supplementation early can reverse early MBD.
• Respiratory infection: Causes wheezing, open-mouth breathing, mucus around the nostrils, and reduced appetite. Often triggered by temperatures that are too cold or by poor enclosure hygiene.
• Infectious Stomatitis (mouth rot): A bacterial infection of the gum tissue that causes redness, swelling, cheesy discharge in the mouth, and inability or unwillingness to eat. Visible as dark red or necrotic tissue around the gums when you gently open the mouth or when the gecko yawns.

Any of these require veterinary diagnosis and treatment. None resolve on their own.

8. Prey problems — boredom, wrong size, or feeder injury

Some leopard geckos develop strong prey preferences and will simply refuse prey they have decided they no longer want. A gecko fed exclusively on mealworms from juvenilehood may refuse crickets; a gecko accustomed to Dubia roaches may reject mealworms. This is the least medically serious cause of food refusal, but it requires some patience to resolve.

Additional prey-related problems to check:

• Prey too large: Prey should be no larger than the space between the gecko's eyes. Prey that is too large causes stress and refusal.
• Live prey injuring the gecko: Loose crickets left overnight in the enclosure can bite a sleeping gecko. Visible bite marks on the gecko's body, or a gecko that has become reluctant to strike at prey, may indicate this has happened. Always remove uneaten live prey after 15–20 minutes.
• Waxworms addiction: Waxworms are high in fat and extremely palatable — a gecko fed waxworms frequently may refuse to eat less rich prey. Waxworms should be an occasional treat, not a dietary staple.

Normal Fast vs Concerning Fast

When to See a Reptile Vet

For comparison with another reptile that has similar causes of food refusal — particularly brumation and temperature issues — see Why Is My Bearded Dragon Not Eating? The causes overlap significantly but the management differs in some key ways. If you keep multiple reptiles, Why Has My Turtle Stopped Eating? covers the same environmental factors from an aquatic reptile perspective.

Common Questions