Gerbils shake for several reasons, ranging from harmless excitement to serious medical conditions like seizures or illness. The most common cause is epilepsy, which is actually a well-known genetic trait in Mongolian gerbils. But shaking can also signal that your gerbil is too cold, fighting an infection, or lacking key nutrients. Figuring out the cause depends on what the shaking looks like, how long it lasts, and what else is happening at the same time.
Seizures Are Surprisingly Common in Gerbils
Mongolian gerbils have a hereditary tendency toward epileptic seizures, making them one of the few pets where seizures are considered a breed-wide trait rather than a rare condition. These are stimulus-induced seizures, meaning they’re triggered by sudden changes in the environment: a loud noise, handling, a new enclosure, or even just being moved to an unfamiliar space. If your gerbil starts shaking intensely and seems unresponsive, a seizure is the most likely explanation.
Seizures in gerbils progress through distinct stages. The earliest visible sign is rapid, repetitive backward twitching of the ears, which typically appears in gerbils older than about six weeks. This ear movement usually lasts fewer than 15 seconds and may be the only thing you notice at first. With repeated exposure to whatever triggers the episode, the seizure can escalate into a full-body event involving stiffening, falling onto one side, and uncontrolled jerking of the limbs.
Most seizures are very short, lasting less than a minute. Afterward, your gerbil may seem dazed, wobbly, or unusually still for up to ten minutes while it recovers. During this time, the best thing you can do is place the gerbil in a dark, quiet spot and check on it periodically without adding more stimulation. A seizure lasting longer than one minute, or multiple seizures happening back to back without a normal rest period in between, is a veterinary emergency and can indicate serious brain injury.
Your Gerbil Might Be Too Cold
Gerbils are desert animals adapted to warm, dry conditions. The recommended enclosure temperature is 20 to 24°C (roughly 68 to 75°F). If the room drops below that range, especially overnight or in winter, your gerbil may shiver to generate body heat. This looks different from a seizure: the gerbil will still be alert and responsive, but its body will tremble steadily, and it may seem lethargic or reluctant to move.
Prolonged cold exposure leads to genuine hypothermia. Early signs include shivering, weakness, and shallow breathing. If the cold continues, the shivering actually stops and the animal becomes increasingly unresponsive, which is a dangerous sign of neurological shutdown. Keeping the enclosure away from drafts, exterior walls, and air conditioning vents is the simplest prevention. Deep bedding also helps, since gerbils naturally burrow to regulate temperature.
Respiratory Infections and Illness
A sick gerbil may shake or tremble as its body fights infection. Respiratory infections are one of the more common illnesses in pet gerbils, and the labored breathing they cause can make the whole body rock or heave visibly. You might notice the gerbil’s sides moving more dramatically with each breath, along with clicking or wheezing sounds, discharge around the nose, and a general loss of energy.
The shaking associated with illness tends to be constant rather than episodic. A gerbil with a seizure shakes violently for under a minute and then recovers. A gerbil with a respiratory infection trembles persistently, often while hunched in a corner, and gets progressively worse over hours or days. Other infections, including those affecting the inner ear, can also produce trembling alongside a head tilt or loss of balance.
Nutritional Deficiencies
Magnesium plays a central role in how nerves and muscles communicate. When levels drop too low, nerve cells become overexcitable, firing signals when they shouldn’t. In animals, this manifests as muscle tremors, twitching, exaggerated reflexes, and in severe cases, full convulsions. Magnesium also helps regulate calcium, sodium, and potassium balance, so a deficiency creates a cascading problem across multiple systems.
Gerbils fed a poor-quality seed mix or an unbalanced diet are most at risk. Commercial gerbil pellets formulated for the species generally provide adequate minerals, but diets heavy in sunflower seeds or low in variety can fall short. If your gerbil’s shaking is mild, intermittent, and not clearly linked to a trigger like handling or loud noise, diet is worth evaluating alongside other possibilities.
How to Tell What’s Causing It
The pattern of the shaking is your best diagnostic clue:
- Sudden onset, short duration, unresponsive during the episode: almost certainly a seizure. Look for the ear-twitching that often precedes it. Recovery within ten minutes is normal for epileptic gerbils.
- Steady trembling with alertness, worse in cool rooms: likely cold stress. Check the ambient temperature and add more bedding.
- Persistent shaking with labored breathing, lethargy, or nasal discharge: points to a respiratory or systemic infection.
- Mild, ongoing twitching without an obvious trigger: could indicate a nutritional deficiency, especially if the diet lacks variety.
For seizure-prone gerbils, reducing environmental stress helps lower the frequency of episodes. Avoid sudden loud noises near the enclosure, handle your gerbil gently rather than grabbing quickly, and keep the cage in a calm area of your home. Many gerbils with mild epilepsy live full, normal lives with minimal intervention. The episodes to worry about are the ones that last longer than a minute, repeat in clusters, or leave the gerbil unable to return to normal behavior afterward.