Fever in Cats: Causes, Signs & Treatment

For cats, the normal body temperature is between 99.5-102.5F. Fever or pyrexia is a higher than normal body temperature in feline- a body temp of at least 39.7 degree Celsius.

The main cause of fever isn’t always clear, as in fever of unknown origin or FUO that is defined as increased body temperature on at least four instances over fourteen days without any clear cause. Or else, fever is regarded as a healthy biological reaction to a viral or bacterial threat. The pyrexia is a reaction to the danger of illness, and not the illness itself. It must be kept in mind that fever can be advantageous for a sick cat or any animal because it lowers the fast division of bacteria and at the same time improved the responsive of the immune system. On the other hand, a high fever or goes on for about a week’s needs medical treatment.

What are the Symptoms of Fever in Feline?

Fever in feline has lots of symptoms such as:

  • Muscle weakness
  • High body temperature
  • Fast heart rate
  • Decreased appetite
  • Dehydration
  • Decreased body fluids
  • Improved respiratory rate  
  • Shock
  • Shivering

Other signs depending on the underlying cause

What are the Causes of Fever in Feline?  

  • Infections (most common parasites, bacterial, viral as well as other microorganisms)
  • Tumors
  • Endocrine illnesses
  • Immune-mediated
  • Metabolic illnesses
  • Miscellaneous inflammatory condition
  • Various toxins
  • Various drugs

Most of the time the exact cause might not be confirmed or established like FUO or fever in unknown origin.


Diagnosing the cause might be an overwhelming task. You’ll need to give your vet with a thorough medical background for your feline, which includes contact with contagious agents, drug use, travel history, allergies, recent vaccination, surgery, and his previous illnesses. A thorough physical test will be performed to know an underlying condition.  

After determining the history and doing the physical test, routine lab tests will take account of a comprehensive blood count, urinalysis and biochemistry profile. These examinations might give useful information in knowing any underlying conditions or infections which might be resulting in the increased body temperature.  With regards to infections, your vet might also perform culture as well as sensitivity testing to determine the specific illness cause organism so that the most appropriate treatment can be prescribed to cure it. More detailed testing might be needed to discover the causative organism.

A radioactive study might also help a lot in the course of the test and might turn up abscesses, tumors, as well as infections. More sophisticated and highly developed approached like echocardiography, ultrasonography, as well as computed tomography scan or CT as well as magnetic resonance imaging or MRI for short, might be used for some instances. Other diagnostic examinations which include endoscopy might be needed in some cases once they appear to have an obstruction or internal infection.


Your vet will treat your feline on the grounds of the final diagnosis. Your cat is rested until recovered to save energy and keep away the aggravation of signs. In some cats, fever might be cured on the first day of medication, while some may take a few weeks to recover.

Leave a Comment