Hamster health: signs of illness to watch for

What does a healthy hamster look like?

Woodgreen and PetMD describe the same picture of good hamster health. Use it as your checklist.

• Bright and awake at its usual time, usually late evening or night
• Eating and drinking normally, with firm, dry droppings
• Moving normally, with no limp, wobble or head tilt
• Eyes clean, clear and bright
• Ears and nose free of discharge, crusts or flaky patches
• Quiet breathing, with no sneezing, wheezing or clicking
• Front teeth light yellow, smooth and wearing evenly
• Coat clean and shiny, with no bald patches, red skin, dandruff or scratches
• Bottom and tail clean and dry
• Feet free of sores, and nails not curling
• Weight steady from week to week

The RSPCA warns that hamsters have high metabolisms and lose condition quickly when unwell, and that they don't show pain outwardly. Woodgreen says they often hide illness until they are very unwell. That is why small changes matter.

How to do a weekly hamster health check

1. Pick the right time. Check in the evening, once your hamster is fully awake. A tame hamster can sit in your cupped hands low over your lap.
2. Weigh it. Put a small tub on kitchen scales, zero them, and pop your hamster in. Write the weight down. Woodgreen says to watch for steady or unexplained loss or gain.
3. Look at the face. Check the eyes, nose and ears for discharge or crusts, and look at the front teeth for length, colour and evenness.
4. Run your fingers over the body. Feel the sides, back and belly for lumps, scabs or wounds. Woodgreen and the RSPCA both say tumours often show on the underside.
5. Check the bottom, feet and nails. The bottom should be clean and dry, the feet free of sores, and the nails short enough not to curl.
6. Check the cage. Look at droppings, the hoard, how much water has gone, and any sharp edges or broken toys that could cut.

Common hamster health problems

The signs and urgency come from Woodgreen, PetMD, the RSPCA and the MSD Vet Manual's owner pages. When in doubt, ring the vet and describe what you see.

Wet tail

Wet tail is the hamster emergency. Woodgreen says it can be fatal within days and responds poorly to treatment, so see a vet as soon as possible. It is often triggered by stress, such as a new home or a new animal nearby, and by bacteria from a cage that is not cleaned well. The MSD Vet Manual says young hamsters are most at risk, and that vets commonly give fluids and antibiotics. Keep a sick hamster away from any others. Our hamster cage cleaning routine helps prevent it.

Breathing problems

Sneezing now and then can just be dust. Repeated sneezing, wheezing or rattly breathing may be an infection. Woodgreen links it to poor airflow and dusty bedding such as sawdust. The RSPCA adds that hamsters can catch colds from people, so keep away when you have one. If breathing looks like hard work, it is an emergency. Our guide to safe hamster bedding covers dust-free choices.

Skin, coat and mites

Syrians are particularly prone to fur mites, says Woodgreen, and incorrect bedding is a common cause. Look for hair loss, red irritated skin, heavy dandruff and orange or black dots in the fur. Hair loss that is even on both sides may instead be hormonal or a tumour. A vet usually prescribes a treatment you put on the skin, says the MSD Vet Manual, and the cage needs cleaning often while it works.

Lumps and tumours

Tumours are common in older hamsters and can grow fast. Woodgreen says mammary tumours are the most common kind and the most likely to be cancerous. The MSD Vet Manual notes many growths are not cancer, but any lump should be checked by a vet soon.

Diabetes

Dwarf hamsters are most at risk, especially on sugary food or when overfed, says Woodgreen. Signs are more thirst, more urine and weight loss. Our hamster diet guide explains how to keep sugar low.

Hamster teeth care

A hamster's front teeth grow all its life and wear down through gnawing. Healthy incisors are light yellow, smooth and even, says Woodgreen, and white only in very young hamsters. Give safe things to gnaw every day: untreated fruit-tree twigs such as apple, hazel or pear, cardboard, and a hard, complete hamster food.

• Check the length weekly. Lift the lip gently during your health check.
• Watch for bar chewing. Woodgreen says it can damage teeth. Overgrown front teeth are also more common after falls or knocks.
• Look out for one broken tooth. The RSPCA warns that if one incisor breaks, the opposite one keeps growing and can eventually stop your hamster eating.
• Leave trimming to a vet. The RSPCA advises a vet visit for overgrown teeth. Never clip them at home.

Skip mineral and salt blocks and coloured chews. Woodgreen says these can be harmful.

Healthy hamster snacks

The healthiest snacks are small pieces of low-sugar veg and herbs, plus a little protein. Broccoli, curly kale, cucumber and bell pepper, and herbs such as basil and parsley, are on Woodgreen's and PDSA's safe lists. One or two mealworms or a small piece of boiled egg once or twice a week covers protein. Keep fruit, nuts and seeds rare: they are sugary or fatty, and PDSA links sugary food to obesity and diabetes. See our hamster safe food list for the rest.

What you can safely do at home

Home care is about comfort while you get vet help, not treatment. Things that are safe to do:

• Keep your hamster somewhere quiet, at a steady 18 to 21°C (64 to 70°F), which PDSA gives as the right range
• Offer water in a shallow bowl as well as a bottle, in case it is weak
• Put food within easy reach, and offer its usual foods only
• Swap to plain, dust-free paper bedding if breathing or skin is the problem
• Clean the cage well and wash your hands after handling, as the MSD Vet Manual advises
• Write down what you've seen, its weight and when it started, for the vet

A cold, still hamster may be in torpor rather than ill. Our hamster temperature guide explains how to warm one gently.

Older hamsters: what changes

Most illness in hamsters comes with age. Woodgreen says that from about two and a half years you can expect longer nails, thin patches of fur, more sleeping and drinking, lumps and some weight loss. Older nails may need trimming by a vet, and wobbly walking is a sign to watch. The MSD Vet Manual adds that older Syrians can develop heart problems, with fast breathing and bluish skin or gums. Our page on hamster lifespan and life stages covers what to expect at each age.

Finding a vet for your hamster

Choose a vet who sees hamsters or small mammals, not every practice does. Woodgreen recommends a vet with small-mammal experience, and PetMD and The Vet Desk suggest a yearly check-up. Bring photos of the cage and food to the appointment, as PetMD suggests. The RSPCA suggests pet insurance for unexpected bills. For the day-to-day care that keeps hamsters healthy, see our hamster care guide.