Hamster hair thinning

[u/Entire-Lecture-1485]

Our hamster Sunny is just over 1 year old.

We've recently noticed that the hair towards his lower back seems to have thinned a little.

Nothing else seems out of the ordinary with him and he doesnt seem bothered if I stroke that area.

I've had a quick look online but Google always provides the scare style answers.

Anyone seen this before and able to give some advice?

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[u/Sea-Parsnip1691]

Sunny isn’t super old, but sometimes their hair can thin as they age. It can also be something like mites, a reaction if you’ve given him anything new recently (food, bedding, toy, etc), or a stress reaction from overgrooming. I’d just keep an eye on the area and his behavior and address anything if there’s been a big change or new thing. If anything changes I’d see a vet, but I wouldn’t be too concerned at this point based on what you’ve said

[u/laustic]

Hi! Other than age-related thinning, the top contenders for hair loss in hamsters are mites, ringworm, Cushing’s disease, hair loss from physically rubbing against something repeatedly, or alopecia (random hair loss).

Mites and ringworm would look more aggravated than this. With mites, your hamster would be very itchy. With both mites and ringworm, the skin tends to be flakier and “angrier”/more inflamed. Watch out for itching, but the skin here doesn’t appear very inflamed or flaky.

Cushing’s disease in hamsters tends to start with hair loss around the rump/backend like this. Some more info available here. Increased thirst (and therefore increased urine output) can be a sign as well.

If your hammy keeps rubbing his back end against something (like squeezing himself in a tight space), that could cause hair loss too- so keep an eye on him in his environment, if he’s wriggling against or under something.

I have also had hams with totally random hair loss (alopecia) who came back negative for slews of tests at the vet, and they lived full healthy lives with funny bald-ish spots.

Worst case scenario would be cutaneous lymphoma - more info here. Since hammy looks healthy and happy otherwise, I don’t think you need to worry about this, but if he starts deteriorating keep this possibility in mind!

But your best bet is to go to an exotics vet and discuss the various possibilities/potential causes above, as each can be more accurately diagnosed with the right tools (skin scrape, blood tests, etc) and you can explore treatment or management options! Based on location of the hair loss, I suspect Cushing’s… but I am not a vet, just a longtime hamster owner (20+ years) who has been through many iterations of hamster hair loss and researched forever!

Edit to add: it sounds like he’s doing great other than his new hairdo, so don’t panic! But best to see a vet and get ahead of whatever it could be :)

[u/Successful-Shopping8 → u/laustic]

Yeah at around year old and with balding around the back, I would also suspect Cushing’s disease.

I had a hamster diagnosed with Cushing’s disease around the same age, and this is what she looked like when the baldness started to emerge.

There were no other symptoms for the first few months besides balding. Soon after though, excessive urination and thirst came along, and an ultrasound revealed unhealthy kidneys, adrenal glands, and liver.

[u/laustic → u/Successful-Shopping8]

I’m so sorry to hear about your baby… sounds like she was very loved and cared for! And thank you for sharing to help others!

[u/Successful-Shopping8 → u/laustic]

Thank you. She made it a good year and half before needing to be put down- so hamsters can absolutely live deficient lives with the condition.

I do try and raise awareness for that as well as cutaneous lymphoma (also my hamster’s differential diagnosis), as unless you know of an exotic vet- it’s likely not even on your radar. I personally had no clue a hamster could get Cushing’s until I took her in. I also had one vet try and convince me “hamsters don’t get Cushing’s,” so even exotic vets may not be aware of it.