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Diabetes Mellitus in cats

Occurrence: common
Location of illness: General/Whole body

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

If the condition worsens / symptoms persist, consult a veterinarian.

Definition

Diabetes mellitus in cats is a chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. disease characterized by elevated blood sugar levels. This occurs due to insufficient production of insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. or a reduced ability of the body to respond to insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus..

The most important facts at a glance

Diabetes mellitus in cats is a condition where blood sugar levels are elevated because either not enough insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. is produced or the body’s cells are resistantResistant means being insensitive to a substance, drug, or treatment. In dogs and cats, resistance can refer to the ineffectiveness of antibiotics against certain bacterial strains or the insensitivity of parasites to certain pesticides. to insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus.. Type 2 diabetes is more common in cats and is often associated with Overweight. Overweight cats have a higher risk because excess fat reduces the insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. sensitivity of cells. Symptoms can include increased thirst and urination, increased appetite, and Weight loss. 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. involves blood and urine tests to measure blood sugar levels and detect glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells. in the urine. Treatment includes insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. administration and a special diet that is low in carbohydrates and high in proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions.. Regular exercise helps control weight and improve insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. sensitivity. Cats can go into remission if they maintain an appropriate lifestyle, but this is not guaranteed. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. focuses on a balanced diet and regular exercise. Research aims to better understand genetic, nutritional, and environmental factors and to develop more effective treatment strategies. Regular veterinary check-ups are important to detect early signs of diabetes.

Causes

Insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. is a hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. produced by the pancreasThe pancreas is an organ that produces digestive enzymes and hormones, including insulin. It plays an important role in digestion and blood sugar regulation. that plays a crucial role in regulating blood sugar levels. It enables cells to absorb glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells. from the blood and use it as an energy source. In diabetes mellitus, this process is disrupted, leading to persistently high blood sugar levels.

There are two main types of diabetes mellitus in cats: Type 1 diabetes, where the pancreasThe pancreas is an organ that produces digestive enzymes and hormones, including insulin. It plays an important role in digestion and blood sugar regulation. does not produce enough insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus., and Type 2 diabetes, where the body’s cells become resistantResistant means being insensitive to a substance, drug, or treatment. In dogs and cats, resistance can refer to the ineffectiveness of antibiotics against certain bacterial strains or the insensitivity of parasites to certain pesticides. to insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus.. Type 2 diabetes is far more common in cats and is often associated with Overweight and lack of exercise.

Overweight cats have an increased risk of developing diabetes, as excess body fat can reduce the insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. sensitivity of cells. Genetic factors also play a role, and certain breeds like the Burmese appear to be more susceptible to developing the disease.

Other risk factors include age, diet, and possibly environmental factors. Older cats are more frequently affected, and a diet rich in carbohydrates and low in proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. can increase the risk.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

The symptoms of diabetes mellitus in cats often develop insidiously and can be easily overlooked. Common signs include increased thirst (polydipsiaPolydipsia refers to an increased feeling of thirst and increased fluid intake. It can be a symptom of various diseases, including diabetes mellitus and kidney disease.) and frequent urination (polyuriaPolyuria refers to a significantly increased urine output. It can be a symptom of various diseases, including diabetes mellitus, kidney disease, and hormonal disorders.). These symptoms are the result of the kidneys trying to filter excess sugar from the blood, leading to increased urine production.

Another common symptom is Weight loss despite an increased appetite. Cats with diabetes often lose weight because their body cells cannot effectively absorb and utilize glucoseGlucose is a simple sugar and the body’s main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells., leading to the breakdown of fat and muscle massIn pathology, the term “mass” is used to describe an abnormal lump or growth in the body. A mass can form in the skin or subcutaneous tissue, or even inside the body. The causes can be benign (not cancer) or malignant (cancer). for energy.

Other symptoms may include lethargy, a dull coat, and general weakness. In advanced cases, diabetic ketoacidosisDiabetic ketoacidosis is a serious and life-threatening condition that occurs in dogs and cats with uncontrolled diabetes mellitus. Insulin deficiency leads to a sharply elevated blood sugar level and the formation of ketone bodies, resulting in acidification of the blood. can occur, a life-threatening condition that requires immediate medical attention.

Diagnosis

The 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. of diabetes mellitus in cats is based on a combination of clinical symptoms and diagnostic tests. A veterinarian will typically perform a complete clinical examination and order blood and urine tests to determine blood sugar levels and check for signs of glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells. in the urine.

Elevated blood sugar levels combined with glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells. in the urine are a strong indicator of diabetes. Sometimes it may be necessary to measure fructosamineFructosamine is a lab value that reflects average blood glucose levels over a period of about two to three weeks. Fructosamine is formed by the binding of glucose to proteins in the blood and serves as an indicator of blood glucose control in diabetics. levels in the blood, which represents an average of blood sugar levels over the past few weeks, providing a better overview of the cat’s blood sugar levels.

In some cases, additional tests may be required to rule out other diseases that can cause similar symptoms, such as hyperthyroidism or Cushing’s syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment..

Therapy

The treatment of diabetes mellitus in cats requires careful monitoring and control of blood sugar levels. One of the main methods of treatment is the administration of insulin, which is usually given twice daily in the form of injections. The veterinarian will determine the exact dose and the insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. preparation best suited for the cat.

In addition to insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. 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., diet plays a crucial role in the treatment of diabetes. A low-carbohydrate, high-protein diet can help stabilize blood sugar levels and control body weight. It is important to design the cat’s diet in consultation with a veterinarian to ensure all nutritional needs are met.

Exercise is another important aspect of treatment. Regular physical activity can help control weight and improve insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. sensitivity. The veterinarian can provide recommendations on how to safely and effectively encourage the cat to exercise.

Prognosis and follow-up care

The prognosis for cats with diabetes mellitus can vary and depends on several factors, including the severity of the disease, response to treatment, and the ability to change the cat’s lifestyle. With appropriate treatment and monitoring, many cats can lead happy and fulfilling lives.

It is important for cat owners to work closely with their veterinarian to effectively manage the disease. Regular check-ups and adjustments to treatment may be necessary to keep blood sugar levels stable and prevent complications.

Some cats may go into remission, meaning they no longer require insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. 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., as long as they maintain an appropriate diet and lifestyle. However, this is not possible for all cats and should not be considered guaranteed.

Prevention

The preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of diabetes mellitus in cats focuses on maintaining a healthy lifestyle. A balanced diet is crucial to avoid Overweight, as Obesity is a significant risk factor for the development of diabetes. It is important to offer a cat a diet that is rich in proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. and low in carbohydrates, as this can help stabilize blood sugar levels.

Regular physical activity also plays an important role. Daily play and exercise not only control the cat’s weight but also improve its insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. sensitivity. Cat toys that stimulate hunting instincts can help keep the cat active.

Regular veterinary check-ups are essential to detect early signs of diabetes or other health problems. An annual blood testA blood test is a laboratory procedure in which blood is drawn and analyzed to obtain information about the body's health. It can include various parameters such as blood sugar, blood count, liver and kidney values. can help identify changes in blood sugar levels early. Cat owners should observe changes in their cat’s behavior or weight and report them to their veterinarian.

Additionally, owners should avoid giving their cat food intended for humans, as this often contains unsuitable nutrient compositions. By following these preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. measures, the risk of a cat developing diabetes can be significantly reduced.

Outlook on current research

Research into diabetes mellitus in cats has made significant progress in recent years. Scientists are working to better understand the genetic, nutritional, and environmental factors that contribute to the development of this disease. One focus is on identifying specific genes that could make cats more susceptible to diabetes. These genetic studies could lead to targeted breeding programs in the future that reduce the risk of diabetes in certain breeds.

Another important aspect of research is improving treatment strategies. New insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. preparations are being developed that enable more stable blood sugar control and improve the quality of life for affected cats. In addition, alternative treatment methods are being researched, such as the use of oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. medications that increase insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. sensitivity or reduce the liver’s glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells. production.

Nutritional research also plays a crucial role. Studies are investigating which nutrient compositions are most effective in the preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. and treatment of diabetes in cats. There is evidence that a high-protein, low-carbohydrate diet could be beneficial. Researchers are also testing dietary supplements that can stabilize blood sugar levels.

Another promising area is the study of the microbiota in the gut of cats. The composition of gut bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. could play a role in the development and control of diabetes. By understanding these connections, new probiotic or prebiotic treatments could be developed that reduce the risk of diabetes or improve metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. control.

Overall, research into diabetes mellitus in cats is becoming increasingly interdisciplinary. Veterinarians, geneticists, nutritionists, and microbiologists are working together to paint a more comprehensive picture of the disease and develop new, more effective treatment approaches. These efforts promise to bring significant improvements in the preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. and treatment of diabetes in cats in the near future.

Frequently asked questions (FAQs)

What is diabetes mellitus in cats? Diabetes mellitus is a metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. disease in which the cat’s body does not produce enough insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. or cannot effectively use the insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. it has. This leads to elevated blood sugar levels, which can cause various health problems in the long term.
What symptoms indicate diabetes in cats? Common symptoms include increased thirst, frequent urination, increased appetite with concurrent Weight loss, and general weakness. In advanced diabetes, lethargy and Vomiting may also occur.
How is diabetes diagnosed in cats? 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. is usually made through blood and urine tests that determine blood sugar levels and the presence of glucoseGlucose is a simple sugar and the body's main source of energy. The concentration of glucose in the blood is regulated to meet the energy needs of the cells. in the urine. Elevated fructosamineFructosamine is a lab value that reflects average blood glucose levels over a period of about two to three weeks. Fructosamine is formed by the binding of glucose to proteins in the blood and serves as an indicator of blood glucose control in diabetics. levels in the blood can also indicate diabetes.
Can all cats get diabetes? Yes, theoretically all cats can develop diabetes, but certain factors increase the risk. Overweight, lack of exercise, genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases., and older age are known risk factors.
Is diabetes curable in cats? Diabetes in cats is generally not curable, but it is treatable. With the right 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. and care, many cats can lead normal lives. In some cases, remission can be achieved, meaning the cat no longer needs insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus. treatment.
What treatment options are available for diabetic cats? The main treatment consists of administering insulininsulin is a hormone produced by the pancreas. It regulates blood sugar levels by promoting the entry of glucose into cells. insulin deficiency or impaired insulin action are key features of diabetes mellitus., often in combination with a special diet. Regular monitoring of blood sugar levels is also important. In some cases, oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. medications or supplements may help.
How important is diet in the treatment of diabetes in cats? An adapted diet plays a central role in treatment. A diet high in proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. and low in carbohydrates can help keep blood sugar levels stable. It is important to control food intake and maintain regular feeding times.
Can lifestyle changes help prevent diabetes in cats? Yes, a healthy lifestyle can reduce the risk. These include a balanced diet, regular exercise, and avoiding Overweight. Regular veterinary check-ups can help detect the disease early.
How often should blood sugar be monitored in a diabetic cat? The frequency of blood sugar measurements can vary. More frequent measurements are required at the start of treatment. Over time, the frequency can be adjusted depending on the stability of blood sugar levels and veterinary recommendation.
What happens if diabetes is left untreated in cats? Untreated diabetes can lead to severe health problems, including diabetic ketoacidosisDiabetic ketoacidosis is a serious and life-threatening condition that occurs in dogs and cats with uncontrolled diabetes mellitus. Insulin deficiency leads to a sharply elevated blood sugar level and the formation of ketone bodies, resulting in acidification of the blood., nerve damage, and organ damage. In the long term, this can be life-threatening, which is why early 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 are crucial.

Frequently asked questions (FAQs)

1. What is diabetes mellitus in cats?

Diabetes mellitus is a metabolic disease in which the cat's body does not produce enough insulin or cannot effectively use the insulin it has. This leads to elevated blood sugar levels, which can cause various health problems in the long term.

2. What symptoms indicate diabetes in cats?

Common symptoms include increased thirst, frequent urination, increased appetite with concurrent Weight loss, and general weakness. In advanced diabetes, lethargy and Vomiting may also occur.

3. How is diabetes diagnosed in cats?

Diagnosis is usually made through blood and urine tests that determine blood sugar levels and the presence of glucose in the urine. Elevated fructosamine levels in the blood can also indicate diabetes.

4. Can all cats get diabetes?

Yes, theoretically all cats can develop diabetes, but certain factors increase the risk. Overweight, lack of exercise, genetic predisposition, and older age are known risk factors.

5. Is diabetes curable in cats?

Diabetes in cats is generally not curable, but it is treatable. With the right therapy and care, many cats can lead normal lives. In some cases, remission can be achieved, meaning the cat no longer needs insulin treatment.

6. What treatment options are available for diabetic cats?

The main treatment consists of administering insulin, often in combination with a special diet. Regular monitoring of blood sugar levels is also important. In some cases, oral medications or supplements may help.

7. How important is diet in the treatment of diabetes in cats?

An adapted diet plays a central role in treatment. A diet high in protein and low in carbohydrates can help keep blood sugar levels stable. It is important to control food intake and maintain regular feeding times.

8. Can lifestyle changes help prevent diabetes in cats?

Yes, a healthy lifestyle can reduce the risk. These include a balanced diet, regular exercise, and avoiding Overweight. Regular veterinary check-ups can help detect the disease early.

9. How often should blood sugar be monitored in a diabetic cat?

The frequency of blood sugar measurements can vary. More frequent measurements are required at the start of treatment. Over time, the frequency can be adjusted depending on the stability of blood sugar levels and veterinary recommendation.

10. What happens if diabetes is left untreated in cats?

Untreated diabetes can lead to severe health problems, including diabetic ketoacidosis, nerve damage, and organ damage. In the long term, this can be life-threatening, which is why early diagnosis and treatment are crucial.