
Cat stomach cancer is a serious and often misunderstood disease.
The prognosis for cats with stomach cancer is generally poor, with a median survival time of around 4-6 months after diagnosis.
Unfortunately, the 5-year survival rate for cats with stomach cancer is less than 10%.
Cats with stomach cancer often present with non-specific symptoms, such as loss of appetite, weight loss, and vomiting.
The exact cause of stomach cancer in cats is still unknown, but it's thought to be linked to chronic inflammation and scarring in the stomach lining.
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Causes and Symptoms
Unfortunately, the exact cause of stomach cancer in cats is still unknown. Cats with gastrointestinal lymphoma are more likely to develop gastric lymphoma as the disease spreads.
Inflammatory bowel disease (IBD) can also increase the risk of stomach cancer in cats, as it can sometimes progress to gastric or gastrointestinal lymphoma over time.
Similar lifestyle choices that affect risk in humans, such as diet and exercise, have not been found to have a significant association with stomach cancer in cats.
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Causes

The causes of stomach cancer in cats are often mysterious, but we do know that cats with gastrointestinal lymphoma are more likely to develop gastric lymphoma as the disease spreads.
Cats with inflammatory bowel disease (IBD) can be at risk of developing gastric or gastrointestinal lymphoma over time.
There aren't many lifestyle choices that have been proven to affect the risk of gastric neoplasia in cats, unlike in humans where diet and exercise are known to play a role.
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Symptoms
As a cat owner, it's essential to recognize the symptoms of stomach cancer in cats. Vomiting is a common symptom, and it can be accompanied by blood in the vomit or stool.
Diarrhea is another possible symptom, which can be a sign of stomach cancer. If your cat is experiencing diarrhea, it's crucial to monitor their overall health.
Blood in the vomit or stool is a concerning symptom that requires immediate attention. If you notice blood in your cat's vomit or stool, seek veterinary care right away.
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Weight loss is a common symptom of stomach cancer in cats. If your cat is losing weight, it may be a sign of a more serious underlying issue.
Lethargy, or decreased energy levels, is another possible symptom. If your cat is normally energetic but seems lethargic, it's a good idea to consult with a veterinarian.
Loss of appetite, or anorexia, is a common symptom of stomach cancer. If your cat is not eating, it can lead to weight loss and other health problems.
Here are some common symptoms of stomach cancer in cats:
- Vomiting
- Diarrhea
- Blood in the vomit or stool
- Weight loss
- Lethargy (decreased energy levels)
- Loss of appetite or anorexia
If your cat is losing blood from a stomach tumor, you might also notice signs of anemia, such as pale gums and a dramatic decrease in energy levels.
Diagnosis and Stages
Diagnosis of cat stomach cancer typically involves a thorough history of the cat's health, a complete physical examination, and various diagnostic tests such as biochemistry profile, urinalysis, and complete blood count (CBC).
A veterinarian may also perform abdominal X-rays and ultrasounds to identify changes in the stomach and intestinal walls, such as thickening of the wall. Contrast radiography can be used to enhance visualization of tissue and improve localization of the tumor.
Stomach cancer in cats is often described in stages based on the spread of the cancer to other locations in the body and the pet's overall health at the time of diagnosis.
Leiomyosarcoma of Intestine
Leiomyosarcoma of Intestine is a serious condition that affects older cats, typically those over six years old. This cancerous tumor arises from the smooth muscles of the intestines.
It's essential to note that all breeds of cats are equally predisposed to leiomyosarcoma. This means that regardless of your cat's breed, age, or size, they can still develop this condition.
Leiomyosarcoma of the intestine has a tendency to metastasize to other sites in the gastrointestinal tract and other body organs. This can lead to severe health complications and a poor prognosis.
Diagnosis
Diagnosing stomach cancer in cats requires a thorough history of their health, including the onset and nature of symptoms. This is because many cats with stomach cancer may not show obvious signs.
A complete physical examination is a crucial step in the diagnostic process, but it's often normal or non-specific for cats with symptoms of stomach cancer. Dehydration, weight loss, pale gums, and lethargy are some of the non-specific exam findings that may be present.
A biochemistry profile, urinalysis, and complete blood count (CBC) are typically performed, and the results are usually within normal ranges. However, in some cats with advanced forms of the disease, abnormalities such as anemia, leukocytosis, and hypoglycemia may be noted.
Abdominal X-rays and ultrasounds are useful diagnostic procedures that help identify changes in the stomach and intestinal walls, such as thickening of the wall. Contrast radiography can enhance visualization of tissue and improve localization of the tumor.
Endoscopy is another valuable tool for direct visualization of the affected areas, allowing the veterinarian to visually inspect the region and remove a sample for biopsy to confirm diagnosis.
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Cat Stages
Cancer in cats is often described in stages based on the spread of the cancer to other locations in the body.
The stage of a cancer depends on the type of cancer it is, not its original location. For example, in the case of gastric lymphoma, the most common type of stomach cancer in cats, it's often late-stage by the time of diagnosis.
Cancer can also be described in grades based on its aggressiveness and likelihood of spread. High-grade cancers, like gastric lymphoma, are aggressive and less likely to respond fully to chemotherapy.
Late-stage cancers have often spread from or to other tissues in the body, which can make treatment more challenging.
Treatment and Cost
The cost of treating stomach cancer in cats can be substantial, ranging from $1,000 to $3,000 for initial diagnostic tests, depending on which tests are performed.
Surgery to remove gastric neoplasia can cost between $4,000 and $7,000, and a round of chemotherapy can range from $3,500 to $6,000.
Treating lymphoma, the most common cause of stomach cancer in cats, involves a combination of oral and injectable chemotherapy medications, which are often well-tolerated by cats and don't come with the same side effects as in humans.
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Cat Treatment Options

Cat treatment options vary depending on the type of cancer, tumor size, and location. Surgery is often the best option for cats with a single, isolated stomach mass.
Surgical removal can be performed to remove the bulk of the mass. Chemotherapy is usually used after surgery to treat any remaining cancer or cancer that has already spread.
Chemotherapy is a common treatment for lymphoma, which is a type of cancer that causes most feline stomach tumors. A combination of oral and injectable chemotherapy medications is used to treat lymphoma.
Radiation therapy may also be used, either alone or in addition to surgery. Prednisolone, a steroid, can be prescribed for palliative or hospice care if chemotherapy is not an option.
Chemotherapy is often well-tolerated in cats and does not typically cause the same side effects seen in humans.
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Cost to Treat
The cost of treating stomach cancer in cats can be quite steep. Initial diagnostic tests can range from $1,000 to $3,000, depending on the specific tests performed.

These costs can add up quickly, and it's essential to have an accurate estimate of the expenses involved. Abdominal ultrasound is generally less expensive than gastroscopy.
Surgery to remove gastric neoplasia can cost anywhere from $4,000 to $7,000, depending on the type of surgery required. This is a significant investment for many pet owners.
A round of chemotherapy can also be expensive, costing between $3,500 and $6,000. This is a critical factor to consider when deciding on the best course of treatment for your cat.
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Prognosis and Life Expectancy
Without treatment, a cat will die from stomach cancer or its side effects within about one month.
The prognosis with treatment varies depending on the type of cancer. Gastric lymphoma, for example, has a survival of 6-18 months, depending on response to chemotherapy.
Unfortunately, the long-term prognosis for stomach cancer in cats is generally poor.
There is currently no way to prevent stomach cancer in cats.
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Frequently Asked Questions
Are cats in pain with stomach cancer?
Yes, cats with stomach cancer may experience pain, which can significantly impact their quality of life. Your veterinarian may take steps to manage pain and improve your cat's comfort.
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