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Hair Loss (Alopecia) in cats

Author: Dr. med. vet. Gisa Löwe | Last modified: 20.02.2026

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

ORANGE for extensive weeping or ulcerating areas, Fever, severe Itching, or rapid progression.

Unsure about what’s wrong with your pet? Feel free to use our Symptom Checker for more clarity

Definition

Hair loss, medically known as alopecia, is the loss of fur in cats that goes beyond the normal amount of shedding. It can occur locally or be distributed throughout the body and is often a sign of underlying health problems.

Can Occur with the Following Diseases:

Basics and possible causes

Hair loss in cats can be caused by a variety of factors, ranging from harmless seasonal changes to serious health problems. A basic understanding of the cat’s skin and fur structure is helpful in identifying the causes of alopecia. Cats have a dense coat of fur consisting of primaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. hairs and fine underhairs. The fur protects the skin and helps regulate body temperature.

Hormonal imbalances, such as those that occur with thyroid diseases or adrenal glandThe adrenal gland is a glandular organ located above the kidneys in dogs and cats that produces hormones such as epinephrine, norepinephrine, and corticosteroids. These hormones are important for the stress response, metabolism, and electrolyte balance. diseases, can lead to hair loss. These hormones regulate many bodily functions, including hair growth, and an imbalanceImbalance refers to an imbalance or disruption of normal function or composition in the body, which can lead to health problems. can disrupt the normal hair growth cycle.

Parasites such as fleas, mites, or lice are common causes of hair loss in cats. These parasites can irritate the skin, leading to intense scratching and licking, which in turn exacerbates hair loss. Allergic reactions to environmental factors or food ingredients can also play a role.

Infections, both bacterial and fungal, can attack the cat’s skin and cause hair loss. Ringworm, a common fungal infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease., leads to circular, bald patches and is highly contagiousContagious means infectious. Diseases that can easily be transmitted from one animal to another or from animals to humans are referred to as contagious..

Psychogenic factors, such as stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. or boredom, can also lead to hair loss. Cats under stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. tend to lick or scratch excessively, leading to hair loss. This type of alopecia is often referred to as psychogenic lick alopecia.

Typical accompanying symptoms

Bald patches: Localized areas without hair are often the most noticeable sign of alopecia. The affected areas may be smooth or scaly.
Redness or skin irritation: The affected skin areas may be reddened or inflamed, indicating an underlying irritation or infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease..
Scratching or licking: Frequent scratching or licking of the affected areas indicates itching or discomfort.
Scaling: Scales may be visible on the skin, especially in cases of dryness or infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease..
Behavioral changes: Cats may withdraw or appear irritated due to discomfort or itching.
Weight loss or appetite changes: In systemic diseases, weight loss or changes in appetite may occur in addition to alopecia.

When to see a vet?

A visit to the veterinarian is urgently needed if the hair loss occurs suddenly and for no apparent reason or is accompanied by other symptoms such as severe itching, wounds, or behavioral changes. A veterinarian should also be consulted if the hair loss persists or worsens despite home remedies.

Severe cases of hair loss that are accompanied by open wounds, severe redness, or a secondary infectionA secondary infection occurs when an already weakened individual suffers an additional infection, often because the immune system is impaired by the primary infection. also require immediate veterinary care. These symptoms may indicate a serious health problem that requires professional diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment.

Symptom recognition for the pet owner and veterinary diagnostic procedure

It is important for the pet owner to observe the hair loss closely and document any accompanying symptoms. Information about the cat’s diet, behavior, and any current or past health problems can be helpful to the veterinarian. Photos of the affected areas can also be useful.

The veterinarian will first perform a thorough clinical examination. This may include blood tests to detect hormonal imbalances or infections. Skin scrapings or fur samples can be examined for parasites or fungal infections. A biopsy of the skin may be necessary in some cases to rule out more serious conditions.

If an allergic reaction is suspected, allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. tests can be performed. This can be done through exclusion diets or special blood tests to identify the specific allergens.

What the pet owner can do and professional therapy options

The pet owner can take some measures to relieve the cat’s discomfort and support the healing process. It is important to keep the affected areas clean and dry to prevent infections. Regular brushing of the fur can help remove loose hairs and promote blood circulation to the skin.

A balanced diet rich in essential fatty acids can support fur growth and improve skin health. The pet owner should ensure that the cat has access to enough fresh water to support skin hydration.

StressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. reduction is also an important factor. Ensuring that the cat has a calm and safe environment can help prevent psychogenic alopecia. Toys and interactive play can help relieve boredom and reduce stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being..

If parasites are the cause of the hair loss, appropriate antiparasitic agents recommended by the veterinarian should be used. It is crucial to follow the instructions carefully to ensure the cat’s safety.

Outlook on current research

Hair loss in cats, also known as alopecia, has attracted increasing interest in veterinary medical research in recent years. Researchers are investigating the genetic, hormonal, and environmental factors that contribute to alopecia in cats. One focus of the research is the identification of specific genes responsible for hair growth cycles. It explores the extent to which genetic anomalies increase the risk of alopecia. InitialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. results suggest that certain breeds may be more susceptible to hair loss due to genetic predispositions.

Another area of research focuses on the role of hormones in relation to hair loss. In particular, it examines how disorders of thyroid and adrenal function affect fur growth. Current studies show that an imbalanceImbalance refers to an imbalance or disruption of normal function or composition in the body, which can lead to health problems. of hormones such as cortisolCortisol is a steroid hormone produced in the adrenal cortex. It plays an important role in the body's stress response, as well as in the metabolism of proteins, lipids, and carbohydrates. Cortisol also helps regulate blood sugar levels and suppress the immune system. or thyroxineThyroxine, also known as T4, is a thyroid hormone that regulates important functions in metabolism, growth, and development in dogs and cats. An over- or underproduction of thyroxine can lead to thyroid diseases. can lead to increased hair loss. Researchers are developing new diagnostic tests to detect hormonal imbalances more quickly and accurately, allowing for timely treatment.

Environmental factors, such as stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and nutrition, are also in the focus of research. Scientists are investigating how stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. affects the cat’s immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. and may lead to hair loss. Experiments with different feed compositions are being carried out to understand how nutrient deficiencies or excesses affect fur growth. InitialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. evidence suggests that omega-3 and omega-6 fatty acids may have a protective effect on fur health.

Technological advances enable researchers to use imaging techniques to observe the growth of hair follicles and document changes in fur patterns. These methods help to better understand the causes of hair loss and to develop new treatment methods. The use of 3D scanning and high-resolution microscopes offers detailed insights into the structure of the hair follicles and their reaction to various influences.

In the long term, the research aims to develop personalized treatment approaches for cats with alopecia. By combining genetic, hormonal, and environmental data, veterinarians could create specific therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. plans tailored to the individual needs of each cat. These tailored approaches could improve the effectiveness of the treatments and significantly increase the quality of life of the affected cats.

Frequently asked questions

1. What are the most common causes of hair loss in cats?

Hair loss in cats can be caused by a variety of factors, including allergies, parasites, hormonal imbalances, stress, and genetic predispositions. Often, it is a combination of several of these causes.

2. How can I tell if my cat's hair loss is serious?

If the hair loss occurs suddenly, is accompanied by skin redness, itching, or wounds, or if your cat shows other symptoms of illness, you should consult a veterinarian. Uniform or seasonal hair loss, on the other hand, may be normal.

3. Can allergies cause hair loss in cats?

Yes, allergies are one of the most common causes of hair loss in cats. Cats can be allergic to food, environmental allergens such as pollen or dust mites, and even certain materials, which can lead to itching and excessive scratching.

4. Are there home remedies that can help with hair loss?

Some home remedies, such as supplementing the diet with omega-3 and omega-6 fatty acids, can help improve skin health and reduce hair loss. However, it is important to consult with a veterinarian before using home remedies.

5. How is hair loss in cats diagnosed?

A veterinarian will take a thorough medical history and perform a physical examination. Diagnostic tests may include skin scrapings, blood tests, allergy tests, and biopsies to determine the cause of the hair loss.

6. Is hair loss more common in certain cat breeds?

Some cat breeds, such as Sphynx or Devon Rex, are genetically predisposed to less fur or hair loss. Other breeds may be more susceptible to hair loss due to genetic factors or hereditary diseases.

7. Can stress cause hair loss in cats?

Yes, stress is a known factor that can lead to hair loss in cats. Changes in the environment, new pets, moves, or other stressful situations can weaken the immune system and lead to fur loss.

8. How can I prevent hair loss in my cat?

Regular grooming, a balanced diet, and avoiding stress can help prevent hair loss. For known allergies, triggers should be avoided. Regular health checkups with a veterinarian are also advisable.

9. Can hormonal problems cause hair loss?

Yes, hormonal problems such as hypothyroidism or Cushing's syndrome can cause hair loss in cats. These conditions require accurate diagnosis and treatment by a veterinarian.

10. Is hair loss normal in old cats?

In older cats, hair loss may occur due to age-related changes in the body. Nevertheless, sudden or excessive hair loss should always be examined by a veterinarian to rule out serious health problems.