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Fever In Cats

Fever In Cats

If your cat is running a fever it may indicate an underlying health problem that requires urgent treatment. Today, our Concord vets discuss some of the causes and symptoms of fevers in cats and what to do if your cat has a fever.

Fever in Cats

As with people, cats will often develop a fever if their immune system is fighting off an infection or disease. The normal body temperature for cats is around 100.4º to 102.5º Fahrenheit. A fever is characterized by a temperature of more than 102.5º F in cats.

If your feline friend shows any of the signs of fever below it is essential to seek veterinary care. Cats that develop a fever higher than 106º F are at serious risk of damage to their vital organs.

Signs of Fever in Cats

Depending on the underlying cause, if your cat has a fever you may notice the following symptoms:

  • Lack of appetite
  • Weakness or lethargy
  • Shivering
  • Rapid heart rate
  • Decreased activity
  • Decreased drinking
  • Dehydration
  • Poor grooming
  • Vomiting
  • Diarrhea

Taking Your Cat's Temperature

To take your cat's temperature, simply use a digital thermometer aimed at your cat’s ear, or use a pediatric rectal thermometer for a more accurate reading. Never use a mercury thermometer when taking your pet's temperature! If the thermometer breaks it can be fatal to your kitty.

The best way to accurately measure your pet's temperature and determine whether your cat has a fever is to use a pediatric rectal thermometer. Apply petroleum jelly to the thermometer to lubricate it, then gently insert it. It's important not to go too far as it could damage your cat's delicate rectal tissue. You may need someone to help you calmly restrain your cat while you insert the thermometer. Leave the thermometer in place for at least two minutes to get a correct reading.

If you think that your cat may have a fever but you are uncomfortable taking its temperature, contact your veterinarian right away to book an appointment. Your vet will be able to quickly assess your kitty's temperature and overall state of health.

Causes Of Feline Fever 

Fevers generally occur in cats when their immune system is activated by conditions such as:

  • Bacterial and viral infections
  • Fungal infection
  • Internal injury
  • Trauma
  • Parasites
  • Autoimmune disease
  • Certain medications
  • A tumor
  • Immune-mediated inflammatory disease
  • Poisoning
  • Metabolic disorders
  • Endocrine disorders

Conditions that Can Cause Fever in Cats

Outdoor cats are at the highest risk for exposure to diseases than indoor cats. There are several serious conditions that can cause fever in cats, including:

Bobcat Fever in Cats (Cytauxzoonosis)

Bobcat fever is an acute, sometimes fatal disease in cats caused by the bite of a tick infected with the Cytauxzoon Felis parasite. This condition often strikes healthy, young adult cats that spend time outdoors.

Valley Fever (Coccidioidomycosis)

Valley fever in cats is caused by the inhalation of the soil fungus Coccidioides immitis found in desert regions of the Southwestern United States. Symptoms of valley fever in cats include fever, lethargy, poor appetite, and coughing, but can progress to severe joint and back pain, seizures, and blindness.


Haemobartonellosis is an antibiotic-resistant bacterial blood infection seen in cats. This condition often leads to urinary tract infections and pneumonia which are very hard to treat.


Ehrlichiosis is a tick-borne condition that can lead to fever in cats. The signs of Ehrlichiosis in cats include fever, swollen lymph nodes, lethargy, decreased appetite, abnormal bruising or bleeding, and eye inflammation.

Milk Fever (Eclampsia)

Eclampsia typically occurs in cats approximately 4 weeks after giving birth to kittens. Early signs of milk fever in cats include a stiff walk, restlessness, and panting (panting is not usual in cats).

Cat Scratch Fever (Bartonellosis)

This condition can be passed between animals and can be transmitted to humans. In cats, the disease is typically spread through contact with flea feces. Symptoms of cat scratch fever in cats include fever, swollen glands, lethargy, decreased appetite, and in some cases reproductive difficulties.


This is one of the most common parasitic diseases, leading to symptoms like fever, diarrhea, cough, difficulty breathing, jaundice, and seizures. In severe cases, this condition can be life-threatening.

What To Do If Your Cat Has a Fever

NEVER give your cat human medications without the explicit advice of a veterinarian! Many of the medications that humans take to feel better, such as acetaminophen, can be extremely toxic to cats.

Ensure your cat stays hydrated by ensuring that they have easy access to fresh clean water and make sure they have a comfortable place to relax.

If your cat has a fever for longer than 24 hours or goes above 106º F contact your veterinarian to book an urgent appointment or visit your local emergency animal hospital right away.

Your vet will do a full examination of your cat to determine the cause of your pet's fever, and prescribe the best treatment to help restore your cat's good health. In some cases, even after an extensive veterinary examination, the cause may not be evident and your cat could be diagnosed with a fever of unknown origin (FUO). If your cat has moderate or severe dehydration, intravenous fluids may be used to help your cat feel better and fight off illness.

Note: The advice provided in this post is intended for informational purposes and does not constitute medical advice regarding pets. For an accurate diagnosis of your pet's condition, please make an appointment with your vet.

At All Bay Animal Hospital, our vets provide quality care for pets. If your cat is showing signs of fever or other symptoms, get in touch right away!

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All Bay Animal Hospital is accepting new patients! Our experienced vets are passionate about the health of Concord companion animals. Get in touch today to book your pet's first appointment.

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