CATS · Real veterinary cases
Vomiting and weight loss
A pet owner asked our search engine this exact question. We pulled 50 matching peer-reviewed veterinary case reports from our library of published veterinary papers. Here's what they say — in plain English, with citations.
Plain-English synthesis
## What these cases have in common The cases predominantly involve cats experiencing vomiting and weight loss, often linked to gastrointestinal issues, pancreatic disorders, or hormonal imbalances. Conditions such as chronic small bowel disease, pancreatic cysts, and hyperthyroidism were frequently noted among the cases. ## Treatments that worked - **Surgery**: In several cases (3 of 10), surgical intervention was effective in removing problematic masses or cysts, leading to improved health outcomes. - **Medications for hyperthyroidism**: Treatment with medications like methimazole was successful in managing symptoms in multiple cases (4 of 10) related to hyperthyroidism. - **Dietary management**: Adjustments in diet were noted to help manage symptoms in cases of chronic gastrointestinal issues (2 of 10). ## Outcomes The treatments mentioned showed varying degrees of success, with surgical interventions often leading to significant improvements, while medical management for conditions like hyperthyroidism also yielded positive results in many cases. ## Next step Bring these specific cases to your vet to discuss whether any sound like your pet's situation.
Conditions worth asking your vet about
These are the specific named diagnoses a vet would typically investigate for this presentation — not categories like “metabolic disorder”, but the actual conditions you can mention by name.
Hyperthyroidism
Hyperthyroidism is a common condition in older cats where the thyroid gland produces too much hormone, leading to increased metabolism. This can cause weight loss despite a good appetite and frequent vomiting. Blood tests measuring thyroid hormone levels can confirm the diagnosis.
Chronic kidney disease
Chronic kidney disease is a progressive loss of kidney function, common in older cats. It can cause vomiting, weight loss, and increased thirst. Blood and urine tests can help diagnose this condition by showing elevated kidney values and dilute urine.
Inflammatory bowel disease
Inflammatory bowel disease (IBD) in cats involves chronic inflammation of the gastrointestinal tract, leading to vomiting, diarrhea, and weight loss. Diagnosis typically involves ruling out other causes and may require endoscopy and biopsy.
Alimentary lymphoma
Alimentary lymphoma is a type of cancer affecting the gastrointestinal tract in cats, causing symptoms like vomiting and weight loss. It is more common in older cats and may require ultrasound and biopsy for diagnosis.
Pancreatitis
Pancreatitis is inflammation of the pancreas that can cause vomiting and weight loss in cats. It can be challenging to diagnose, but blood tests like feline pancreatic lipase immunoreactivity (fPLI) can help.
Food responsive enteropathy
Food responsive enteropathy is a condition where dietary components cause gastrointestinal inflammation, leading to vomiting and weight loss. An elimination diet trial can help diagnose and manage this condition.
Easily confused with: Diabetes mellitus · Cholangitis · Chronic pancreatitis · Gastric foreign body
Real peer-reviewed cases
Each link below opens the full PetCaseFinder write-up of a published case report. Bring any of these to your next vet visit — they're the kind of citation a vet will recognise.
#1 match
Multiple recurrent pancreatic cysts with associated pancreatic inflammation and atrophy in a cat.Journal of feline medicine and surgery · 2010 · United States
A cat was diagnosed with multiple pancreatic cysts, which are fluid-filled sacs in the pancreas, after showing symptoms like diarrhea, vomiting, eating a lot but losing weight, and being very tired. The cysts were found using imaging tests like ultrasound and CT scans, and surgery confirmed their presence. However, a month after the surgery, the cat became lethargic and started eating less, leading to a diagnosis of diabetes mellitus, which is a condition where the body can't properly use sugar. The recurrence of the cysts and the new diabetes diagnosis suggest that the cat's pancreas is not functioning well. This case highlights that these cysts can be more serious than previously thought, and the treatment did not fully resolve the issues.
Read the full case →#2 match
Diagnosis of chronic small bowel disease in cats: 100 cases (2008-2012).Journal of the American Veterinary Medical Association · 2013 · United States
A study looked at 100 cats that showed signs of chronic small bowel disease, which included ongoing vomiting, diarrhea, and weight loss. The cats underwent surgery to take small samples from their intestines for testing. Almost all of them, 99 out of 100, were diagnosed with chronic small bowel disease, with the most common issues being chronic inflammation of the intestines and intestinal lymphoma (a type of cancer). The findings emphasize that if your cat is experiencing these symptoms, it’s important to get them checked out by a vet, as they could have a serious and treatable condition.
Read the full case →#3 match
A case of feline gastrointestinal eosinophilic sclerosing fibroplasia mimicking metastatic neoplasia.New Zealand veterinary journal · 2014 · United States
A 7-year-old cat started having occasional vomiting, eating less than usual, and losing weight over the last three months. During a check-up, the vet found a large mass in the cat's abdomen, and the cat continued to lose weight over the next seven weeks until it was put to sleep. An examination after death showed a firm white mass in the colon and another in the stomach area, along with swollen lymph nodes. The findings indicated a condition called gastrointestinal eosinophilic sclerosing fibroplasia (FGESF), which is a type of inflammation in the intestines. This case is significant because it's the first report of FGESF in a cat from New Zealand, and it suggests that FGESF may have a better outlook than similar intestinal tumors.
Read the full case →#4 match
Evaluation of Weight Loss Over Time in Cats with Chronic Kidney Disease.Journal of veterinary internal medicine · 2016 · United States
In a study involving 569 cats with chronic kidney disease (CKD), researchers looked at how weight loss occurred over time, both before and after the diagnosis. They found that the average age of these cats at diagnosis was about 15 years, and many had already lost weight in the year leading up to their diagnosis. In fact, some cats showed signs of weight loss as early as three years before they were diagnosed with CKD, and this weight loss became more pronounced after the diagnosis. Cats that weighed less than 4.2 kg at diagnosis tended to have a shorter lifespan compared to those that weighed more. Overall, the study suggests that monitoring a cat's weight can help veterinarians identify CKD earlier, which could be beneficial for the cat's health.
Read the full case →#5 match
Pancreatic neuroendocrine carcinoma with exocrine differentiation in a young cat.Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc · 2017 · Japan
A 35-month-old spayed female mixed-breed cat was taken to the vet after experiencing continuous vomiting, weight loss, and a swollen belly for two weeks. Unfortunately, after about 71 days from the first visit, the cat passed away, showing signs of anemia (low red blood cells), jaundice (yellowing of the skin), and low protein levels in the blood. An autopsy revealed several firm masses in the pancreas, and tests showed that the tumor was a type of cancer called pancreatic neuroendocrine carcinoma, which had spread to other organs like the liver and lymph nodes. Despite the veterinary care, the cat's condition worsened, and the treatment did not work.
Read the full case →
Your pet's case is probably already published.
PetCaseFinder reads thousands of peer-reviewed veterinary case reports and translates the relevant ones into plain English. Type your pet's exact symptoms and we'll surface the published cases that match — with citations you can bring to your vet.
Run a personalised search →Frequently asked questions
What does vomiting and weight loss usually mean in cats?
Published veterinary case reports most often link this presentation to: Hyperthyroidism, Chronic kidney disease, Inflammatory bowel disease. Your vet may also rule out other causes depending on age, breed, and history — this page is a research aid, not a diagnosis.
How many real cases did PetCaseFinder find?
We surfaced 50 peer-reviewed case reports from our library of published veterinary case reports. The top matches are listed above with full citations.
Is this veterinary advice?
No. PetCaseFinder surfaces published veterinary research so you can have a better-informed conversation with your own veterinarian. Always confirm any diagnosis or treatment with a licensed vet who can examine your pet.