MANY cats display some vomiting from time to time in their lives. Often it is transient, but in some cases it is repetitive. It is hard to exactly define how often a cat can vomit without it being considered abnormal. Some would suggest that any amount of vomiting that recurs is not right. Certainly if a cat is vomiting every day or every second day, it is likely there is something not quite right causing this vomiting. Cats often suffer from intestinal inflammation on a spectrum from food intolerance, through inflammatory bowel disease and sometimes into cancerous changes in the intestines. A good starting point for cats that display ongoing vomiting is a diet change to a hypoallergenic diet. This can help in many situations. However, if the vomiting persists a further work-up should be taken into consideration. Where a cat is losing weight, vomiting and seems unwell, there is further concern that a more serious problem is at foot. Intestinal adenocarcinoma is a slow growing cancer of the intestinal wall that leads to narrowing of the intestinal tube. As the tube narrows the flow of food is affected and this can precipitate vomiting. With time the narrowness can be near complete and the cat’s ability to eat is severely restricted and rapid weight loss can ensue. This process can occur over many months with more severe signs of projectile vomiting only developing towards the end. This cancer often spreads to the lymph nodes near the intestines and may spread further afield. Ultrasounds of the abdomen may pick up the intestinal abnormality as well as local lymph node enlargements. Surgical excision of the primary mass and rejoining of the intestinal segments is useful even in the face of metastasis already having occurred, as this is a reasonably slow growing tumour. If your cat is vomiting with any regularity, a veterinary assessment is a good idea.