# Why Is My Hamster Not Opening Its Eyes? Causes and Care If your hamster is not opening its eyes, the most common reasons are sticky discharge from irritation or infection, a scratch or foreign object in the eye, or a sign of a deeper illness. Hamsters hide problems well, so closed or squinting eyes are often the first clue you get. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - A hamster that keeps one or both eyes shut is usually uncomfortable, not just sleepy. Healthy hamsters open their eyes within minutes of waking. - Sticky yellow or white discharge, crusted lids, or a swollen eye point to infection or injury and need a vet visit. - Eye problems can be the first visible sign of a respiratory infection, dental disease, or another illness, so look at the whole hamster. - Do not use human eye drops, saline, or home remedies on a hamster's eye. You can safely wipe the outer lid with a warm damp cotton ball if the eye is crusted shut. - Call an exotic pet vet the same day if the eye is swollen, cloudy, bleeding, or if your hamster is also sneezing, wheezing, or not eating. ## What Closed Eyes Look Like and What Is Normal A healthy hamster sleeps with its eyes closed and opens them when it wakes. Dwarf hamsters and Syrian hamsters both do this. If you gently wake your hamster during the day and it opens its eyes, looks around, and grooms, that is normal. The problem is when your hamster cannot open his eyes even after waking, or when one eye stays shut while the other is open. You may see: - A crusty, matted lid that is stuck together - A wet or weepy eye with clear, white, or yellow discharge - Squinting, blinking, or pawing at the face - A swollen, bulging, or red eye - Cloudiness or a blue-gray haze over the eye - The eye looking sunken or smaller than usual Some hamsters also stop eating, stop grooming, or sit hunched in a corner. Those are signs the eye problem is part of a bigger health issue. ## Why Is My Hamster Not Opening Its Eyes? Main Causes Many owners search "my hamster can't open his eyes" after finding their pet with a stuck-shut lid. The cause can be minor or serious. Here is a breakdown. | Cause | Typical clues | How urgent | |---|---|---| | Sticky discharge from irritation | Clear or white crust, one or both eyes, hamster otherwise active | Vet visit within a day or two | | Bacterial eye infection | Yellow or green discharge, red or swollen lid, squinting | Same-day vet visit | | Eye injury or foreign object | Sudden onset, one eye only, pawing at face, tearing | Same-day vet visit | | Respiratory infection | Sneezing, wheezing, nasal discharge, closed eyes, poor appetite | Emergency, same day | | Dental disease | Drooling, weight loss, overgrown teeth, eye bulging on one side | Same-day vet visit | | Abscess near the eye | Firm swelling, warmth, pain when touched | Same-day vet visit | | Tumor or cancer | Slow-growing swelling, bulging eye, weight loss | Vet visit soon | | Environmental irritant | New bedding, dust, ammonia smell from soiled cage | Fix the cage, then vet if no improvement | | Torpor or cold stress | Cold room, hamster cool to the touch, very still | Warm slowly, then vet | Some of these causes overlap. A hamster with a respiratory infection may have closed eyes because of discharge and because it feels too sick to open them. A hamster with a dental abscess may have a bulging eye on the side where the tooth root is infected. Cancer is uncommon but possible. One case report described a Siberian hamster with facial swelling, a bulging left eye, and squinting of the right eye [1]. The underlying problem was a histiocytic sarcoma plus a kidney tumor, and the facial swelling came from blood clots in the facial veins [1]. This is rare, but it shows that eye signs can sometimes reflect disease elsewhere in the body. ## Red Flags That Make It an Emergency Call an exotic vet or an emergency clinic right away if you see any of these: - The eye is swollen, bulging, or bleeding - The eyeball itself looks cloudy, torn, or out of place - Your hamster is sneezing, wheezing, or breathing with its mouth open - Your hamster is not eating, not drinking, or not pooping - Your hamster is cold, limp, or barely responsive - Both eyes are stuck shut and the hamster cannot find food or water - There is pus, a bad smell, or a fast-growing lump near the eye Hamsters decline quickly. A hamster that was fine yesterday can be critically ill today. Do not wait a week to see if it improves. ## Safe Things You Can Do at Home While Waiting You cannot treat a hamster's eye at home, but you can keep your pet comfortable and avoid making things worse. ### Check the cage environment Look at the bedding. Dusty shavings, scented bedding, and ammonia buildup from a dirty cage can irritate eyes. Move your hamster to a clean cage with unscented paper bedding. Keep the room warm and draft-free. ### Wipe the outer lid gently If the eye is crusted shut, dampen a clean cotton ball with warm water and gently wipe the outside of the closed lid from the inner corner outward. Do not pry the eye open. Do not touch the eyeball. Do not use human eye drops, saline, or any medication unless your vet prescribes it. ### Keep food and water close A hamster that cannot see well may struggle to find its bowl and bottle. Place food and water near its sleeping spot. Offer soft foods like a small piece of cooked egg or plain cooked oatmeal if your hamster is not eating its normal kibble. ### Reduce stress Keep the cage quiet and away from other pets. Do not handle your hamster more than needed. Stress makes illness worse. ### Watch for other symptoms Write down what you see: which eye, how long it has been closed, what the discharge looks like, whether your hamster is eating, and whether you hear any breathing sounds. This helps your vet. If your hamster is cold and still, it may be in torpor, which is a state of lowered body temperature and metabolism. You can read more about that in [Understanding Hamster Torpor: Causes and Safe Treatment](/knowledge/veterinary-medicine/small-mammal-care/understanding-hamster-torpor-causes-and-safe-treatment). If you are unsure whether your hamster needs a vet at all, [Hamster Vet Care: When to Seek Help and What to Expect](/knowledge/veterinary-medicine/small-mammal-care/hamster-vet-care-when-to-seek-help-and-what-to-expect) walks through what to expect at the appointment. ## What the Veterinarian Will Check and Test Your vet will start with a full physical exam. They will look at both eyes, the eyelids, the teeth, the nose, the ears, and the breathing. They will weigh your hamster and check its body condition. Depending on what they find, they may: - Flush the eye with sterile saline to look for a foreign object - Use a fluorescein stain to check for a scratch on the cornea - Swab the discharge for a culture - Examine the teeth with a scope, since dental disease often causes eye signs - Listen to the lungs and check for respiratory infection - Take an X-ray or ultrasound if a mass or abscess is suspected - Run blood work if your hamster is very ill Treatment depends on the cause. Bacterial infections are treated with antibiotics. Eye injuries may need ointment or drops. Abscesses often need to be drained or surgically removed. If the problem is dental, the teeth need to be trimmed or filed. If the problem is environmental, the fix is a cage change plus time. Your vet will calculate any medication dose from your hamster's weight and health. Never give a dose based on a guess or a human product. If your hamster has a lump near the eye that turns out to be an abscess, [Hamster Abscesses: Causes, Treatment, and Prevention](/knowledge/veterinary-medicine/small-mammal-care/hamster-abscesses-causes-treatment-prevention) explains how those are managed. ## Prevention and Daily Monitoring You can lower the chance of eye problems with a few simple habits. - Use unscented, low-dust bedding. Avoid cedar and pine shavings. - Clean the cage often enough that ammonia does not build up. Spot-clean daily and do a full change weekly. - Keep the room at a steady, comfortable temperature. Cold stress can affect a hamster's immune system and blood values [2]. - Offer a balanced diet with limited treats. Dental problems often start with the wrong food. - Check your hamster's eyes, nose, teeth, and bottom every few days. Early detection matters. - Weigh your hamster weekly on a small kitchen scale. Weight loss is an early warning sign. - Keep the cage free of sharp edges, wire floors, and small objects that could scratch an eye. Hamsters are seasonal animals, and their bodies respond to light and temperature changes. Research in Siberian hamsters shows that short photoperiods can shift behavior and brain chemistry, including anxiety-like grooming [3]. This does not cause eye problems directly, but it is a reminder that environment affects hamster health. Immune function in hamsters also varies with temperature and day length [2]. A stable, warm, well-lit room supports overall health. ## Limitations and When to Contact a Veterinarian This article cannot tell you what is wrong with your specific hamster. Only a veterinarian who examines your pet can do that. Individual cases need a veterinarian. Use these timing guidelines: - Emergency now: bulging or bleeding eye, open-mouth breathing, cold and limp, not responding, severe swelling - Same day: yellow or green discharge, one eye suddenly shut, sneezing or wheezing, not eating, a lump near the eye - Routine visit within a day or two: mild clear discharge, crusty lid that improves after wiping, no other symptoms If you are not sure, call your vet and describe what you see. Most exotic vets would rather answer a quick question than treat a hamster that waited too long. ## Frequently Asked Questions ### Can I use human eye drops on my hamster? No. Human eye drops are not made for hamsters and can cause harm. Only use medication your veterinarian prescribes for your hamster, and follow the exact instructions. ### Will my hamster's eye heal on its own? Sometimes a mild irritant clears up after a cage change, but you cannot tell the difference between irritation and infection at home. If the eye is still shut after a day, see a vet. ### Is a closed eye always a sign of eye disease? No. It can be a sign of pain or illness elsewhere, such as a respiratory infection or dental problem. Your vet will check the whole hamster, not just the eye. ### How do I know if my hamster is in pain? Hamsters in pain often squint, hunch, stop grooming, eat less, or become less active. A closed eye with any of these signs needs prompt veterinary care. ### Can eye problems in hamsters be prevented? Many can. Clean, low-dust bedding, a balanced diet, regular cage cleaning, and weekly weight checks lower the risk. Dental care and early vet visits also help. ## Related Articles - [Understanding Hamster Torpor: Causes and Safe Treatment](/knowledge/veterinary-medicine/small-mammal-care/understanding-hamster-torpor-causes-and-safe-treatment) - [Hamster Vet Care: When to Seek Help and What to Expect](/knowledge/veterinary-medicine/small-mammal-care/hamster-vet-care-when-to-seek-help-and-what-to-expect) - [Hamster Abscesses: Causes, Treatment, and Prevention](/knowledge/veterinary-medicine/small-mammal-care/hamster-abscesses-causes-treatment-prevention) - [Syrian Hamster Care Guide](/knowledge/veterinary-medicine/small-mammal-care/syrian-hamster-care) - [Why Does My Hamster Have Red Eyes? Normal or Concern?](/knowledge/veterinary-medicine/small-mammal-care/hamster-red-eyes) - [Why Is My Hamster Not Eating? Causes and Next Steps](/knowledge/veterinary-medicine/small-mammal-care/hamster-not-eating-causes) - [Why Is My Hamster Not Drinking Water? Causes and Warning Signs](/knowledge/veterinary-medicine/small-mammal-care/hamster-not-drinking-water) ## References 1. [Histiocytic Sarcoma and Bilateral Facial Vein Thrombosis in a Siberian Hamster (Phodopus sungorus)](https://pubmed.ncbi.nlm.nih.gov/25926398/). Comparative medicine, 2015. 2. [Low temperature and short photoperiod exerted different influences on hematological parameters, innate immunity, and cytokines in female striped hamsters](https://pubmed.ncbi.nlm.nih.gov/41269272/). Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology, 2025. 3. [Transcriptomic analyses of limbic structures across photoperiodic phenotypes in the Siberian hamster and Japanese quail brains](https://pubmed.ncbi.nlm.nih.gov/42632427/). General and comparative endocrinology, 2026. ## Further Reading - [Merck Veterinary Manual: Hamsters](https://www.merckvetmanual.com/all-other-pets/hamsters) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)