6 Common Cat Illnesses and What You Need to Know

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By Pure Paws Veterinary Care | November 18, 2025

As a cat owner, it’s essential to stay informed about common cat illnesses and how they can affect your pet’s health. Our feline companions may be good at hiding discomfort, but early detection can make a significant difference in treatment outcomes. In this article, we’ll explore six common cat illnesses that every pet owner should know about, the symptoms to watch for, and how to care for your cat if they fall ill.

1. Upper Respiratory Infections (URI)

Upper respiratory infections, commonly referred to as cat colds, are one of the most prevalent illnesses in cats. These infections are often caused by viruses, such as feline herpesvirus or calicivirus, and are highly contagious. URIs can affect your cat’s nose, throat, and eyes, leading to symptoms like:

  • Sneezing
  • Runny nose or nasal congestion
  • Watery eyes
  • Coughing
  • Decreased appetite

What You Should Do: If your cat shows symptoms of a URI, it’s important to get them checked by a veterinarian, especially if they have difficulty breathing or eating. Mild cases often resolve on their own with supportive care, such as keeping your cat hydrated and ensuring they are in a warm, quiet environment. For severe cases, your vet may prescribe antibiotics or antiviral medications.

2. Feline Lower Urinary Tract Disease (FLUTD)

FLUTD is an umbrella term that refers to several conditions affecting a cat’s urinary system. This includes urinary tract infections, bladder inflammation, or urinary blockages. FLUTD is more common in male cats, particularly those who are overweight or stressed. Symptoms of FLUTD may include:

  • Frequent urination
  • Straining to urinate
  • Blood in urine
  • Licking the genital area excessively
  • Accidents outside the litter box

What You Should Do: FLUTD can be serious, especially if your cat is unable to urinate, which can lead to a life-threatening condition known as urinary obstruction. If you notice any of the symptoms, take your cat to the vet immediately. Treatment may involve medications, dietary changes, and in some cases, surgery.

3. Diabetes Mellitus

Diabetes is a common condition in cats, particularly those that are overweight. It occurs when the body is unable to properly regulate blood sugar levels. The symptoms of diabetes in cats can develop gradually and include:

  • Increased thirst and urination
  • Weight loss despite increased appetite
  • Lethargy
  • Vomiting

What You Should Do: If you notice any of these signs, consult with your veterinarian for blood tests to check your cat’s glucose levels. Diabetes can be managed with insulin injections, dietary changes, and regular vet check-ups. Early diagnosis and consistent care can help your cat live a long, healthy life.

4. Feline Hyperthyroidism

Hyperthyroidism is a common endocrine disorder in older cats, where the thyroid gland becomes overactive and produces too much thyroid hormone. This results in symptoms such as:

  • Weight loss despite an increased appetite
  • Restlessness or hyperactivity
  • Vomiting
  • Increased thirst and urination
  • Rapid heart rate

What You Should Do: If your cat exhibits any of these signs, consult with your vet. Hyperthyroidism can be treated with medication, surgery to remove the thyroid gland, or radiation therapy. It is important to address hyperthyroidism as soon as possible to avoid complications such as heart disease or high blood pressure.

5. Dental Disease

Dental disease, including gingivitis and periodontal disease, is common in cats, especially as they age. Left untreated, dental issues can lead to severe infections, tooth loss, and other health problems. Common signs of dental disease include:

  • Bad breath
  • Drooling or pawing at the mouth
  • Difficulty eating or chewing
  • Red or inflamed gums

What You Should Do: Regular dental care is essential for maintaining your cat’s overall health. Brushing your cat’s teeth, providing dental treats, and scheduling annual dental check-ups with your vet can help prevent dental disease. In severe cases, your vet may recommend professional cleaning or tooth extraction.

6. Feline Leukemia Virus (FeLV)

FeLV is a viral infection that affects the immune system of cats, making them more susceptible to other illnesses. It’s primarily spread through close contact with infected cats, such as through grooming or sharing food and water bowls. Symptoms of FeLV include:

  • Loss of appetite
  • Weight loss
  • Fever
  • Pale gums
  • Vomiting or diarrhea

What You Should Do: FeLV is a serious condition that requires veterinary care. There is no cure, but supportive treatment can help improve your cat’s quality of life. Vaccination is the best prevention, so be sure to ask your vet about vaccinating your cat, especially if they go outdoors or interact with other cats.

As a responsible cat owner, it’s important to recognize the symptoms of common cat illnesses and seek prompt veterinary care. Regular check-ups with a trusted veterinarian in New York City, NY, along with staying informed about the signs of illness, will help ensure your cat lives a long, healthy, and happy life.

If you suspect your cat may be suffering from any of the conditions mentioned above, don’t hesitate to schedule a visit to your vet. Early diagnosis and treatment are key to providing the best care for your furry friend.

FAQs

Q1. What are the signs of upper respiratory infections in cats?
Ans.
Upper respiratory infections in cats can cause symptoms like sneezing, a runny nose, watery eyes, coughing, and loss of appetite. If your cat shows these signs, it’s important to consult your veterinarian.

Q2. How can I prevent feline lower urinary tract disease (FLUTD)?
Ans.
To prevent FLUTD, ensure your cat has access to plenty of fresh water, a high-quality diet, and regular litter box maintenance. Reducing stress and promoting a healthy weight can also help prevent this condition.

Q3. What is the best diet for cats with diabetes?
Ans.
A diabetic cat requires a high-protein, low-carbohydrate diet. Your veterinarian can recommend a specific prescription food or provide guidance on appropriate commercial foods to manage diabetes.

Q4. Can hyperthyroidism in cats be cured?
Ans.
While hyperthyroidism cannot be cured outright, it can be effectively managed with medication, surgery, or radiation therapy. Early detection and treatment are crucial for the best outcome.

Q5. How can I take care of my cat’s dental health?
Ans.
Regular brushing, dental treats, and professional cleanings at the vet are essential for maintaining good dental health. Be sure to have your cat’s teeth checked regularly by a veterinarian.

Q6. Is feline leukemia virus contagious?
Ans.
Yes, FeLV is highly contagious and can spread through saliva, urine, and feces, especially during close contact. If your cat is at risk, ask your veterinarian about vaccination options.