Common Mourning Gecko Health Issues (Egg-Laying Changes the Picture)

Mourning geckos are hardy in a properly humid, planted enclosure, but one biological fact shapes its health risks more than anything else: every animal is female, and every mature female lays eggs regularly, with or without a mate present.

Metabolic Bone Disease (MBD)

The flagship health issue, driven by calcium or vitamin D3 deficiency, often combined with insufficient UVB. Watch for a kinked or wavy tail, depleted calcium sacs (the two white ovals under the throat), curved limbs, appetite loss, loss of coordination, and in severe cases, seizures.

Early cases are often manageable with corrected UVB and calcium, advanced deformities are permanent, a vet visit is warranted at that point.

Egg-Binding (Dystocia)

Follows directly from the point above. A female that's calcium-depleted or dehydrated can fail to pass her eggs. This is a genuine emergency, not something to wait out at home, and in lizards dystocia can progress to death quickly.

A gravid female normally looks round, may eat less and often gets more active as she searches for a laying site. The tell that separates that from trouble is a swollen abdomen with straining. Other signs are lethargy or weakness in the back legs, passing one egg of the pair and not the second, discharge from the vent, or tissue protruding from it. A bright, alert, round gecko is usually just carrying eggs; a round gecko that is dull, weak and pushing needs a vet the same day.

Besides calcium, missing laying sites and low humidity both contribute. Mourning geckos glue their eggs to glass, bark and leaves, so cork, dense planting and a humidity cycle that stays in range give a female places she will use. Treatment ranges from fluids and calcium injections to surgery that removes the eggs, and surgery is often preferred in lizards because oxytocin works less reliably in them than in tortoises.

Eggs and Surplus Geckos

Every mature female adds a pair of eggs every 4 to 6 weeks, so an unmanaged colony will outgrow its enclosure within one to two years. Crowding shows up as competition at the food dish and thin tails on the animals that lose it. There are two ways to hold the number steady. Remove eggs as they are laid and either discard them or raise the hatchlings apart (eggs glued to glass usually break when pried loose), or let them hatch and rehome the surplus through other keepers, which is how many established colonies are managed. Hatchlings that stay need separate housing until they are eating well, since adults eat eggs, hatchlings and juveniles.

Retained Shed

Caused by low humidity. Shed that doesn't come off cleanly can constrict around the toes or tail tip. Generally manageable at home, raise humidity and provide a moist hide, but see a vet if tissue looks like it's dying or the constriction won't release.

Mouth Rot and Parasites

Mouth rot appears as redness, swelling, or a cottage-cheese-like discharge around the mouth. Parasites cause weight loss and poor appetite despite normal feeding, diagnosed through a fecal exam. Both need a vet.

A General Warning Sign

A visibly thin tail combined with weight loss usually points to an underlying issue, whether that's parasites, disease, or simply insufficient feeding for a colony that's grown larger than you originally planned for.

The Husbandry Connection Worth Remembering

Skipping UVB or calcium and D3 supplementation doesn't just risk MBD in the abstract, it directly raises egg-binding risk in a species that's laying eggs constantly regardless of whether you're trying to breed it. This same principle, that most reptile health problems trace back to husbandry rather than bad luck, holds across beginner geckos generally, and the gargoyle gecko health issues guide shows how it plays out in a species that isn't laying eggs on this same constant schedule.

Given how small a mourning gecko is, a thermometer and hygrometer that's actually accurate matters more than usual for catching drift before it becomes a health problem.

Sources & Further Reading