Stomach and Intestinal Cancer Average Cost

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What is Stomach and Intestinal Cancer?

Types of gastrointestinal cancers include adenocarcinoma, leiomyosarcoma, lymphoma, and mast cell tumors. Older cats have a predisposition for developing gastrointestinal cancers. Feline leukemia virus and immunodeficiency virus may also play a role in the development of gastrointestinal cancer.

Stomach and intestinal cancer is a rare type of feline cancer, accounting for less than one percent of all reported cancers in cats. Gastrointestinal cancers are most commonly found in the small intestine. Stomach and intestinal tumors can be benign, but are typically malignant and aggressive. Benignity and malignancy depend on the type of cancer.

Symptoms of Stomach and Intestinal Cancer in Cats

Cats suffering from stomach or intestinal cancer will almost always show changes in eating habits due to tumors in the gastrointestinal tract. Stomach and intestinal cancers are serious conditions that require early detection for the best prognosis. If your cat is exhibiting any of the following symptoms, seek immediate veterinary attention:

  • Changes in behavior
  • Lethargy
  • Loss of appetite
  • Vomiting
  • Diarrhea
  • Blood present in vomit or feces
  • Weight loss
  • Depression
  • Difficulty defecating
  • Abdominal pain or swelling
  • Signs of abdominal infection
  • Masses in the abdomen
  • Pale gums or other signs of anemia



Adenocarcinomas located in the digestive system usually affect the large and small intestines. This type of gastric cancer is extremely rare in cats and doesn’t usually affect the stomach. Adenocarcinomas grow rapidly, tend to be aggressive during metastasis, and may cause blockages in part of the intestines.


This type of tumor can be benign or malignant and originates within the smooth muscle. Leiomyosarcoma can occur in any part of the body, but most commonly affects the gastrointestinal tract. Malignant leiomyosarcomas have a high metastatic rate and typically spread to the lymph nodes and liver.


Lymphoma is a type of aggressive malignant cancer that originates from an uncontrolled growth of lymphocytes. Lymphocytes are a type of white blood cell that protects the cat from foreign bodies or substances that may cause disease. Lymphoma can affect any part of the body, but is most commonly found in the gastrointestinal tract. Lymphoma is the most common type of gastric cancer in cats.

Mast Cell Tumors

Mast cells, like lymphocytes, are a type of white blood cell. While mast cell tumors typically form on the skin, they may also affect the gastrointestinal tract. Bleeding ulcers may be symptomatic of mast cell tumors, and Siamese cats in particular have a predisposition to developing mast cell tumors.

Causes of Stomach and Intestinal Cancer in Cats

The cause of stomach and intestinal cancer in cats will depend on the type of cancer and where it originated. As with most types of cancer anywhere in the body, gastrointestinal cancers are caused when cells begin to grow at an uncontrolled rate. Lymphoma, in particular, may be caused by a previous bout of feline leukemia virus (FeLV) or the immunodeficiency virus. The link, however, is not fully understood by researchers.

Diagnosis of Stomach and Intestinal Cancer in Cats

The vet can make a tentative diagnosis based on presentation of symptoms and a physical examination. Be sure to inform the vet of the duration and extent of your cat’s symptoms, as well as any previous stomach or intestinal problems. An x-ray and a biopsy of the abdominal tissue will be required for a definitive diagnosis. The vet may also conduct other forms of standard testing to assess whether the cancer has spread. In some cases, the vet may perform a gastroscopy, which will require anesthetic.

Treatment of Stomach and Intestinal Cancer in Cats

Treatment will depend on the type and stage of the cancer. Surgery is required for most types of gastrointestinal cancers, apart from lymphoma. Gastrointestinal lymphoma may be partially treated through surgery, but will typically require chemotherapy to ensure the best prognosis possible. 

Before surgery, your vet will run some standard tests, including a blood chemistry profile, blood count, and urinalysis. They may also perform additional x-rays to ensure the cancer hasn’t spread to other organs. The surgery itself will usually involve the partial removal of the stomach and/or affected intestine. The veterinary surgeon will then reconnect the stomach to the intestine. Since radiation therapy can harm nearby organs, this is not usually recommended for most cases of gastrointestinal cancer.

Recovery of Stomach and Intestinal Cancer in Cats

Your cat will typically be hospitalized for two days following surgery, and will receive intravenous fluid therapy during this recovery period. Your vet may prescribe anti-vomiting and pain management medication, as well as antacids to prevent stomach ulcers. 

On the return home, ensure that your cat has a warm, secure place to rest. You’ll need to limit activity for up to three weeks to allow for adequate recovery, and don’t allow the cat to irritate the surgery site. If you notice any bleeding, swelling, or irritation of the surgery site, contact your vet immediately.

If your cat requires chemotherapy – which will be recommended for most malignant tumors – the vet will schedule follow-up appointments to administer chemotherapeutic drugs via injection. These treatments will begin two weeks after surgery and will occur once every two to three weeks for up to five sessions.

Prognosis will depend on the aggressiveness and stage of the cancer at the time of operation, as well as the success of the operation itself. Surgery may be completely curative for benign tumors. Malignant gastrointestinal cancers tend to have a poorer prognosis and a higher recurrence rate.

Stomach and Intestinal Cancer Questions and Advice from Veterinary Professionals

2 Years
Moderate condition
1 found helpful
Moderate condition

Has Symptoms

Watery eyes

Hi, my cat has been pregnant, and she gave birth to one kitten, but even after that she looked pregnant, she is caring for her baby, like she should, she eats properly, but she meows a lot, have been sneezing unusually a lot, and seems like she is pregnant, but masses inside haven't been moving, and seems like something's swollen. I touched it and pressed, it doesn't disturbs her. Her eyes have been watering lately too. She breaths very rapidly in evenings, I thought that is because it's hot. Please help. She's stray, adopted.

Dr. Michele King, DVM
Dr. Michele King, DVM
1385 Recommendations
Bhuri may need to have an x-ray to determine whether she has more kittens. if she is doing well, eating and drinking, she may be fine to monitor, but if she starts to become lethargic, stops eataing, or isn't doign well, it would be best to have her seen.

But she is meowing a lot, sneezing,too. she has bad breath, in her belly it feels like a bulge, swollen, more rather than a kitten because it never moves, and when you touch her stomach, you can feel sort of grumbling noises..

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Russian Blue
15 Years
Serious condition
0 found helpful
Serious condition

Has Symptoms

Poor Appetite
Vomiting blood
Weight Loss

Hello, I went in to see a vet today and she did an ultrasound which showed that my cats stomach is not the normal shape of a stomach and that it has thick lining of growth around it, which she says to be cancer. She said that her other organs look good. My cat also has hyperthyroidism. She’s 15. I took her in because she vomited blood (she’s been vomiting nearly daily since she was a kitten but never blood) and also she’s been eating less. She was wobbly and sick looking. The doctor said that euthanasia is the best option for her. But I don’t want to do that. Is it possible that the cancer is benign? Is it possible that she can still live, with a lot of help from her human family? She’s grooming herself. She purrs. She plays with a laser. She sleeps with her mouse. I don’t see how having 3 rough days means that she needs to be put down.

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
2959 Recommendations
Without examining Moorka it is difficult to weigh in on a sensitive subject like this; when it comes to cancer or suspected cancer we cannot say whether it is malignant or benign without a biopsy. However, even benign stomach tumours may cause an obstruction or other issue which in this case would lead to her being put down. If you are looking for a second opinion, you should visit another Veterinarian in your area for a hands on examination and see if the same prognosis is suggested. Regards Dr Callum Turner DVM

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13 Years
Serious condition
0 found helpful
Serious condition

Has Symptoms

Weight Loss

Arquat recently had eight teeth extracted. After that for the weeks to come he had lost weight 4 pounds within a five week. He has recently been diagnosed with intestinal cancer where his stomach is filling up with fluids. Can this I’ve been caused by the surgery of the extraction of teeth?

Dr. Michele King, DVM
Dr. Michele King, DVM
1385 Recommendations
I'm very sorry that that is happening to Tank. His intestinal cancer would not have been related to his tooth extraction, no. It seems just very bad timing, and luck. I hope that you are able to keep him comfortable for a while longer.

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