Why is my cat lethargic? 20 reasons

Here are 20 reasons why your cat is lethargic or apathetic. I’d suggest that all but two (chronic constipation and URI) require a proper veterinary diagnosis. Lethargy is a natural consequence of feeling ill and therefore is present in most illnesses. You’ll also see loss of appetite accompanying lethargy. Eating poorly will exacerbate the lethargy. This list is probably not entirely comprehensive.

Hypothermia

This is a dangerously low body temperature. You’ll know if this reason is relevant because it will depend on the climatic conditions at the time. If your cat has been lost outside for some time or trapped and when found it lethargic, hypothermia might be the reason. There will also be shivering. At the extreme it results in collapse and coma.

Toxoplasmosis

When symptoms are shown (often they are not) the most common are lethargy, loss of appetite, rapid breathing and coughing.

Bacterial infection – Bordetella

This is an upper respiratory infection (URI). It occurs more severely in young cats and in shelters. Symptoms include: fever, lethargy, sneezing, coughing and discharges from nose and eyes.

Immune related skin problems

There is an inappropriate attack by the immune system on one of the layers of the skin. Symptoms include: pustules on the skin developing into crusts, itching, fever, lethargy and loss of appetite in severe cases.

Hypothyroidism

This is rare in cats. It is a deficiency in thyroid hormone. The coat becomes thin. Other symptoms are: lethargy, weight gain, constipation and mental dullness.

Acute gastritis

This is an irritation of the stomach lining. Signs are severe vomiting, stopping eating after vomiting, lethargy, head hangs over water bowl. Most common cause: ingesting an irritant or poison.

Chronic constipation

Constipation causes a cat to look bloated and she picks at food. Lethargy is a symptom.

Impaired liver function

Cats appear weak and lethargic. Loss of appetite and weight.

Advanced diabetes

Symptoms include: lethargy, loss of appetite, weakness, vomiting, acetone breath, dehydration, laboured breathing.

Pancreatitis

The initial signs of pancreatitis in half of cats suffering this condition include: lethargy, not eating, increased breathing rate. This condition is painful in people. I’d expect it to be the same for cats.

Lung cancer

Lethargy, depression and weight loss but often no direct respiratory signs.

Heartworm disease

Signs of an infectation include: cough especially when exercising, lethargy, weight loss and poor coat condition.

Pyometra

An infection of the uterus. This is life-threatening. Symptoms include: fever, lethargy and weight loss, urinates a lot and drinks lots of water.

Birthing process infection

This is called acute postpartum metritis. An infection of the uterus lining spreading through the birth canal. Symptoms include: lethargy, refusal to eat, hangs head, high rectal temperature.

Shock

This is insufficient blood flow to meet the needs of the cat. Signs include apathy (lethargy).

Bacterial infection Tularmia

A rare infection for cats causing the usual signs such as loss of appetite, lethargy, fever and depression.

Viral respiratory infection

It is to be expected that this illness can cause lethargy and loss of appetite with fever.

Panleuk

This is feline panleukopenia. AKA feline distemper. A viral infection. Highly contagious. It causes severe lethargy, fever and loss of appetite.

Acute infectious enteritis

An infection of the gastrointestinal tract. Signs: vomiting, diarrhoea, fever, lethargy and depression.

Kidney failure

A very common cause of death in elderly cats. My cat died of this. One day she stopped eating and looked at me. I knew it was the end. She had been lethargic for a long time sleeping all the time.

P.S. All these diseases are covered in detail on this site. Please use custom search to find them.

Image source: Fundo vetore desenhado por Photoroyalty – Freepik.com

Source: this site and Cat Owner’s Home Veterinary Handbook.

Leave a Comment

follow it link and logo