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Why Is My Hamster Acting Weird? (All About Hamster Behavior)

Written by Last Updated: Jun 1, 2025

Your hamster’s behavior might seem weird to you, but there could be a perfectly good explanation.

After all, hamsters are small rodents with their own unique behaviors and habits.

So before you start to worry that something is wrong with your furry friend, it’s important to learn about common hamster behavior.

In this guide, we’ll cover some of the most common reasons why your hamster might be acting weird, including boredom, stress, fear, and illness.

We’ll also give you some tips on how to help your hamster feel more comfortable and relaxed.

So if your hamster has been acting weird lately, read on to find out more.

 

Why is my hamster acting weird?

There are several reasons why your hamster might be acting weird. It could be something as simple as being afraid or stressed, or it could be a sign of illness. If your hamster is suddenly acting differently, it’s important to pay attention to other changes in behavior or appearance.

This will help you determine whether there’s cause for concern or not.

Take a closer look at his habits, for example, is he eating and drinking as usual? is he getting enough exercise? is he spending more time in his nest than usual?

By observing your hamster’s behavior, you should be able to get to the bottom of their weirdness!!

 

Common Reasons

Some common reasons why your hamster might be acting weird include:

  • Fear or stress: If your hamster is suddenly acting differently, it could be because it’s afraid or stressed. This is especially likely if there have been changes in its environment, such as a new pet or baby in the house. Fear and stress can cause hamsters to become more active or less active, to stop eating, or start biting.
  • Illness: If your hamster is acting weird and you notice other changes in its behavior or appearance, it could be sick. Some common signs of illness in hamsters include lethargy, weight loss, and diarrhea. If you think your hamster might be sick, take it to the vet for an examination.
  • Pregnancy: Female hamsters can become pregnant even if they haven’t been around a male. If your female hamster is acting weird and you notice her belly is getting bigger, she could be pregnant. Pregnant hamsters may become more aggressive, and they may start nesting or hoarding food.
  • Old age: As hamsters get older, they may start to slow down and become less active. They may also sleep more and have less appetite. If your hamster is acting weird and you notice these changes, it’s probably just a sign of old age.
  • Hormonal imbalance: Hamsters can experience hormonal imbalances as they reach maturity. This can cause them to be more aggressive or even changes in their fur color.

If your hamster is acting weird and you’re not sure why try to pay attention to other changes in its behavior or appearance.

This will help you determine whether there’s cause for concern or not.

If you think your hamster might be sick, take it to the vet for an examination.

 

Behavioral changes

If you’ve had your hamster for a while, you might start to notice that their behavior changes from time to time.

After all, they are living creatures with unique personalities.

However, some behaviors are considered “normal” for hamsters, and others might indicate that something is wrong.

For example, it’s normal for hamsters to be active during the night and sleep during the day.

So if you notice your hamster is up and about during the daytime, it could be a sign that something is bothering them.

Other behaviors, like excessive grooming or avoidance of people and other animals, could also be signs of stress or illness.

If you’re ever concerned about your hamster’s behavior, it’s always best to consult with a veterinarian.

They will be able to help you determine whether your hamster’s behavior is normal or not.

 

Medical conditions

Many medical conditions change your hamster’s behavior especially if your hamster is in pain.

This can be caused by injuries, illnesses, or even tooth problems.

If your hamster is acting lethargic or refusing to eat, he may be in pain and you should take them to the vet right away.

Other signs that your hamster may be in pain include hunching over, hunched posture, crying out when touched, and wheezing or panting.

Some common health problems that can cause strange behavior in hamsters include diabetes, hypoglycemia (low blood sugar), kidney disease, and tumors.

If you suspect your hamster has a medical condition, it’s important to take them to the vet as soon as possible for treatment.

Meanwhile, try to observe your hamster closely and look for other signs of illness such as weight loss, hair loss, diarrhea, vomiting, and excessive thirst or urination.

 

Tips to help your hamster feel relaxed

There are a few things you can do to help your hamster feel relaxed and reduce stress.

First, make sure their cage is big enough and has plenty of hiding places.

Second, avoid handling your hamster too much and give them time to adjust to new surroundings before introducing them to new people or animals.

And lastly, provide your hamster with a variety of toys and enrichment activities to keep them stimulated.

By following these tips, you can help your hamster feel comfortable and reduce its stress levels.

 

Final thoughts

There are a number of reasons why your hamster might be acting weird.

It could be sick or stressed out from a change in its environment.

It might also be experiencing a hormonal imbalance, or simply getting older and less active.

Remember that every hamster is different, don’t try to compare your hamster with another one. What may seem strange to you may be perfectly normal behavior for your pet.

If you have recently brought your hamster home, it may take a little time for it to get used to you and its new home.

In the meantime, try to handle your hamster gently and provide it with plenty of food, water, and bedding material.

Once your hamster has had a chance to settle in, it should start behaving more normally.

Whatever the reason, it’s important to keep an eye on your hamster, and if your hamster’s behavior continues to be strange take it to the vet for a check-up.

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