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Why Do Hamsters Get Bald Spots?

Hamsters naturally shed their fur. This means that it’s quite normal for them to experience some degree of hair loss.

However, they should never show complete baldness in certain areas. This might be an indication of potential health or environmental concerns.
We outline the potential causes of why a hamster gets bald spots as well as what to do.

Here’s why hamsters get bald spots

A hamster may get bald spots due to scent gland rubbing, allergic reactions, overuse of hamster wheels, poor diet, overgrooming, external parasite infestation, skin infection, underlying health conditions, old age and bar biting, and nose fur loss.

Why Do Hamsters Get Bald Spots

Causes of hamster bald spots

Scent gland rubbing

Hamsters have scent glands located on their flanks, near their hips. These glands excrete secretions that serve the purpose of marking territory. 

Scent marking is an essential aspect of hamster behavior. In the wild, this behavior helps hamsters establish and define their territories. 

As pets, hamsters display this behavior and engage in scent marking by rubbing these glands against items within their enclosure, which might include hideouts, toys, cage edges, and separation bridges. 

However, excessive rubbing can lead to bald patches due to the abrasive nature of the process.

While scent marking is normal, it’s important to monitor your hamster’s behavior to ensure that it isn’t rubbing itself excessively due to boredom or stress. 

If you observe over-rubbing, provide your hamster with more engaging activities and remove any sharp or potentially harmful objects from its cage.

Allergic reactions

Hamsters, like humans, can experience allergies, and these allergies can lead to fur loss. One common culprit is the type of bedding you use in your hamster’s cage. 

Dusty bedding can lead to respiratory distress and skin irritation in hamsters.

Some bedding materials, such as cedar and pine, produce a significant amount of dust particles. This not only poses a risk to your hamster’s respiratory health but can also irritate their delicate skin.

One of the best alternatives is undyed and unbleached paper-based bedding. This type of bedding is favored for its softness and its reduced potential to cause skin and fur problems.

Allergies can be relatively easy to address once you identify the cause of your hamster’s fur loss. 

To pinpoint the specific allergen, try replacing the bedding with a different type and observe your hamster. 

If you use multiple bedding materials in your hamster’s enclosure, removing one at a time can help you identify which one triggers the allergy, allowing you to avoid it in the future. 

Be cautious about other potential sources of allergies, such as certain foods or materials used in toys and hideouts. 

Also, refrain from using sprays, perfumes, or household fragrances in your hamster’s environment, as the chemicals in these products can lead to skin irritation.

Overuse of hamster wheels

Hamster wheels are a common feature in hamster cages, offering a source of exercise and entertainment. However, overuse of these wheels can lead to hair loss, particularly on the hind legs. 

This occurs because the repetitive motion of running on the wheel can result in rubbing against the same spots on the legs, leading to sores and eventual bald patches.

Not all hamster wheels are created equal. Large wooden or plastic wheels tend to be less abrasive, making them less likely to cause fur loss. 

If you notice your hamster losing hair on its hind legs, assess how often it uses its running wheel. 

If you have a metal wheel, you might want to consider replacing it with a wooden or plastic wheel that is better suited for your hamster’s comfort and well-being.

Related: Why are there bugs in my hamster’s cage?

Poor diet

The nutritional content of your hamster’s diet plays a significant role in the condition of its fur. One of the early signs of a nutritionally deficient diet is fur loss.

Dietary deficiencies resulting from a low-grain, low-iron, or low-protein diet are common causes of fur loss in hamsters.

To ensure your hamster’s fur remains healthy and vibrant, you must provide a well-rounded diet. 

Some of the best sources of protein for hamsters include mealworms, crickets, cooked chicken, fish, seafood, and specially formulated pellets known as lab blocks. 

Avoid poor-quality seed mixes as they lack the essential nutrients needed for your hamster’s well-being. 

To maintain your hamster’s fur in optimal condition, aim for a balanced diet that includes high-quality seeds, protein sources, and fresh fruits and vegetables.

Related: Why do hamsters stuff their cheeks with bedding?


Hamsters are meticulous when it comes to grooming, using their paws and saliva to keep their fur clean and oil-free. 

While this is normal behavior, excessive grooming can lead to bald patches, notably behind the ears and around the hips, areas their tiny nails can reach.

Over-grooming is often a sign of stress and anxiety in hamsters. Several environmental factors can trigger this behavior, including the presence of other pets, loud noises, overly bright lights, confinement in a cramped cage, cohabitation with another hamster, or having insufficient bedding depth. 

Addressing the sources of stress and discomfort in your hamster’s environment is an effective way to prevent this over-grooming behavior.


Just like other living beings, hamsters are susceptible to mites, tiny parasites that inhabit their skin and fur, feeding on blood and oils. 

When mites feed, they cause itching, prompting hamsters to scratch vigorously. This intense scratching leads to severe fur loss, and mites can also trigger a condition called mange.

Mites can also cause various distressing symptoms in hamsters, including skin inflammation, dry or red patches, redness around the tail and facial areas, relentless itching, and hair loss, particularly on the back and rump. 

Mites are commonly introduced into a hamster’s environment through contaminated food, bedding, or contact with other pets or toys.

It’s important to conduct a thorough cleaning of the hamster’s enclosure and its items to eliminate mites entirely.

Skin infection

Ringworm is a fungal infection that can plague your hamster. It typically reveals itself as a ring-like pattern of hair loss accompanied by flaky, irritated skin.

This fungal culprit thrives in humid environments, making it important to maintain proper cage hygiene and ventilation. 

Also, ringworm can be transmitted from humans to hamsters and vice versa. Although many hamsters may not display visible signs of ringworm, the primary symptom is the emergence of bald patches.

The relentless itchiness that accompanies ringworm can cause fur loss and lead to the formation of painful sores. Identifying and treating ringworm promptly is essential to ensure your hamster’s well-being.

Underlying health conditions

A hamster can also get bald spots due to underlying health conditions which includes Cushing’s disease. 

Cushing’s disease is a comparatively rare yet severe cause of fur loss and bald patches in hamsters. The condition is incurable and often results in a fatal outcome, particularly in older hamsters.

The disease primarily affects the pituitary gland in the brain, leading to irregular hormone production in the body. 

The onset of this disease is marked by various symptoms, including bald patches or thinning fur, dry and flaky skin, weight loss, loose skin, increased thirst, and urination, dark pigmentation on the skin, skeletal muscle wastage, and the development of cuts and scabs that are prone to infection. 

Old age

As hamsters reach their golden years, fur loss and the emergence of bald patches become quite common. 

With aging, hamsters undergo significant changes in their physical appearance. Their once lush fur starts to thin and develop bald patches, creating a noticeable contrast against their youthful appearance. 

While this gradual fur loss is a natural part of the aging process, it’s important to closely observe your hamster’s behavior and overall well-being during this time. 

Related: Why is my hamster wobbling and falling over?

Bar biting and nose fur loss

Bald spots around a hamster’s nose often stem from a behavioral habit known as bar biting. This repetitive bar-biting results in friction-induced fur loss, mainly around the nose area. This continuous chewing can also lead to painful sores, causing distress to the hamster. 

One reason why it happens is when hamsters are confined to enclosures that are smaller than their needs.

The recommended minimum cage size for hamsters is 80 x 50cm, but it’s essential to understand that many hamsters, especially larger and more active female Syrians, may require more spacious accommodations. 

When hamsters find their environment stressful or confining, they also resort to chewing on the cage bars as a form of relief. 

What to do if your hamster has a bald spot

Observe and monitor

Begin by closely observing the bald spot and your hamster’s behavior. Take note of any changes in their activity, eating habits, or signs of discomfort. Monitoring their condition is the first step in understanding the issue.

Check for signs of sores or irritation

Examine the bald area for any signs of sores, redness, or irritation. These can indicate skin problems that need attention.

Adjust the cage environment

Ensure that your hamster’s cage is clean, appropriately sized, and contains adequate bedding and hiding spots. Make sure there are no sharp or abrasive objects that could be causing injury or irritation.

When to see a vet about bald patches in hamsters

Fur loss or shedding is a natural process for hamsters, however, excessive hair loss leading to bald patches is a cause for concern. 

While some hair loss is normal in aging hamsters, excessive or unusual patterns of fur loss should not be dismissed, even in older hamsters. If you’re uncertain whether the hair loss is age-related or something more concerning, consult your veterinarian.

Signs that indicate that you should see a veterinarian immediately include:

Sudden or severe fur loss

If your hamster experiences sudden and significant fur loss, it could be indicative of an underlying health issue. Bald patches that appear abruptly or become extensive should be evaluated by a veterinarian.

Behavioral changes

Changes in your hamster’s behavior, such as increased lethargy, reduced activity, loss of appetite or noticeable discomfort, accompanied by fur loss, may suggest an underlying problem that requires medical assessment.

Sores, redness, or irritation

If you notice sores, redness, or any signs of skin irritation in the areas with fur loss, it’s a clear indication that your hamster may be experiencing discomfort or skin-related problems that need veterinary attention.

Scratching or itching

A Hamster scratching or itching persistently at the bald patches is a sign of discomfort or irritation. This behavior, combined with fur loss, warrants a vet visit.

Signs of infection or parasites

Visible signs of infection, such as pus or a foul odor around the bald patches, or the presence of mites, lice, or other parasites in the fur, should be addressed by a veterinarian to prevent the issue from worsening.