Tumors And Lumps In Hamsters – Symptoms, Treatment, And Care

You might have noticed an odd lump on your hamster recently. Is it cancerous ? Is it benign ? Can hamsters survive surgery to remove a tumor ? 

We’ll cover tumor and odd lumps in this article, including the options you would have when treating your hamster. This is a situation where you will have to see your hammy’s vet often.

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So can hamsters develop a tumor ?

Yes, hamsters can develop tumors. Whether they’re called, lumps, or tumors, the end result is the same. A growth of extra cells, which does not serve a particular purpose and could potentially be fatal.

It can affect any part of the hamster’s body, and can come about at any age. There is an increased chance that older hamsters will develop tumors, compared to young hamsters.

Tumors are treatable  most of the time, especially if noticed early on. It also depends on the location of the tumor. For example a growth on the outside of the leg is easy to remove, but one on the hamster’s ovary is not.

Let’s see how and why tumors come about, so we know what to expect.

Why tumors appear in hamsters

Tumors appear in hamsters pretty much the same way as they appear in humans. Studies haven’t really pin-pointed the main reason tumors appear in humans, so knowing why they appear in hamsters is just as confusing.

However we do know how the tumor forms (this is a very simplistic and sketched-out explanation).

Usually the hamster’s cells have a certain programming. They renew every few days, but their programming can go awry sometimes. As such, old cells can forget to die, but new cells still appear. This leads to an overgrowth, which is not exactly healthy.

It’s not like the hamster is getting a larger lung which will help him. He is growing part of the lung that does not serve a purpose, and will mess with his other internal organs. Take up room, blood, energy, and keep on expanding.

The tumor can become infected sometimes, and this makes the treatment fairly difficult. These cells don’t respond as normal cells would.

Malignant vs benign tumors in your hamster

There are 2 types of tumors. One is benign, meaning not dangerous nor spreading, while the other is malignant meaning it is spreading to other tissues and can be life-threatening.

A benign tumor is just an overgrowth of the cells, but it does not ‘move’ to another part of the body. For example a lump on the leg that just grow to a certain size and then stops, without triggering other growths somewhere else, is benign.

A malignant tumor is one that spreads to other ares on or in the body, because the very cells themselves become contagious, in a way. This means that a growth on the leg can produce a growth on the belly and tail as well.

The best person to decide whether your hamster’s tumor is dangerous or not is the veterinarian. He will examine the hamster, possibly run him through an ultra-sound to see if there are any odd growth on the inside too.

He might also collect a small sample of the tumor, to study it under a microscope. He will come back to you shortly with a diagnosis and a treatment option.

Signs and symptoms your hamster has a tumor

There are very few clear, external signs of your hamster having a tumor. Aside from the tumor itself, if it is on the skin, or right under the skin and becoming a very large bulge/lump.

A noticeable lump will be fleshy, but mostly hard. It will not yield like skin and muscle, and instead feel much like hardened tissue. It does not hurt, but it can press down on certain nerves or blood vessels and thus hurt your hamster.

If the lump is on the skin, you will see it straight away. If it is under the skin, it will not be very clear unless you handle your hamster often, and all over. You need to get a feel for all of his little body, so you will notice where there is an extra lump.

Do keep in mind that female hamsters have teats along their bellies, and the male Syrians have very large testicles hanging around their tail.

Aside from all of this, there are more subtle signs your hamster has a tumor. They don’t necessarily mean there is a tumor present, since they can also indicate other health issues. But here are the most common ones:

  • Low appetite
  • Abnormal droppings – no droppings, bloody droppings, diarrhea (but not necessarily wet tail)
  • Increased thirst (especially for adrenal gland tumors)
  • Lethargy, low energy
  • Huddling in a corner, hiding more often and not coming out too fast
  • Possibly falling over, poor direction (if tumor is affecting inner ear)
  • Weight gain or loss, despite feeding the hamster the same amount (also adrenal gland tumor)
  • Abnormal grooming – much less grooming because the hamster is depleted of energy, or much more grooming since the hamster is licking at the tumor (skin-level)
  • Irritated, grumpy disposition
  • Fur loss, usually in patches

If you see these signs, make sure to tell your veterinarian about this. It’s important for him to know everything that has changed with your hamster friend.

Treating your hamster’s tumor

The first step is to set up an appointment with your veterinarian. You’ll want to look for an vet who has experience with small animals, or even better a vet labeled as ”exotic”. These vets have experience with rodents, reptiles and birds and will have more knowledge on hamsters than a regular veterinarian.

Once you’ve reached your vet’s office, he will look at your hamster and turn him over to see any lumps. There might be an ultra-sound exam too, to see if there are tumors on the inside.

If the vet does find a tumor, and it’s easy to access, he will inspect it closely. He might take a sample of the tumor, which means an actual piece (very tiny) of the skin there. This will show him the structure of the cells, and whether they’re malignant or benign.

According to what the vet will find out about the hamster, and also the location of the tumor, he will set a diagnostic. Once you know that, you can decide together on a treatment for your hamster.

This can take anywhere between a few minutes to a few days, depending on the situation.

Common treatments for the hamster’s tumor

Usually the treatment for a tumor is to remove it. If the tumor is on the outside, like a growth on the hamster’s leg or back, it will be easy to remove. The vet himself might perform the surgery, or he might enlist a surgeon’s help.

However if the tumor is inside the hamster, for example on his kidneys, it is much harder to treat. It can still be removed, but there are a few considerations to take.

The first is whether the hamster, small as he is, will survive the anaesthesia and the ensuing surgery, with all the blood loss.

The second is that the risks associated with surgery on a very small animal usually are very high, which might mean the hamster would have to be put down. This is only if the tumor is hindering the hamster’s life quality.

Deciding to put down the hammy is not easy, and should be thought about very well. You need to take into account whether the hamster can live the rest of his normal life with this tumor.

If it’s the kind of tumor that will spread and grow, then it will slowly eat the poor creature from the inside out. This is a case where putting the hamster to sleep would be the most compassionate and human treatment.

However if the tumor is fairly small, does not grow in time, but is on the inside and can’t be removed without putting the hammy at risk, this is probably a case where the vet would advise letting the hamster live his life.

There is a third option, which involves chemo therapy. As you know from humans that went through such a treatment, chemo is very rough. Many humans do not survive this. Imagine a small, weakened hamster going through it.

You could try, however, and see how the hammy responds. Make sure you talk to your vet about all the options you’ve got, and see which you think is best.

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Caring for the hamster after surgery

If the tumor can be safely removed, them this means your hamster will go through surgery. After he wakes up from his anaesthesia the vet will probably keep him for a day or two, for further observations.

Once you can pick up your hamster, you will also get a set of guidelines from your vet. He will let you know exactly how to care for the hamster, as well as many post-op medications he needs to take.

Do keep in mind that a hamster out of surgery will have the scar still a bit red and swollen in the first few days. That’s normal until the wound heals.

However make sure to check the scar daily, to see if there is an infection. Sometimes, depending on the conditions the hamster is in after the surgery, an infection might occur. This will be noticeable by continued swelling, and pus.

The wound will not close properly and will ooze a white-yellow liquid, and might smell bad as well. If this is the case, rush your hamster friend to the vet immediately.

Also keep in mind that a hamster who was just under surgery will probably not want to be handled for a few days. He is tired, and sore, and he will possibly try to reach the scar to lick at it and clean it. So resist the temptation to pick up your hamster the first few days after the surgery.

As always, the room he lives in must be warm enough, not drafty, and he must be separated from cage mates during his recovery.

A word from Teddy

I hope you found what you were looking for here. I know us hammies don’t normally get sick, but when we do we need your help. A tumor is definitely something we can’t figure out on our own.

If you want to know more about us hamsters, you can check out the related articles below. You’ll find more info on how to keep us happy and safe.

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