Alimentary Lymphoma in Cats

Alimentary lymphoma is a cancer that arises from lymphocytes — white blood cells that normally help defend against infection — within the gastrointestinal tract. In cats, this is one of the more common forms of lymphoma, and it develops when these cells begin to multiply uncontrollably in the lining of the stomach, small intestine, or large intestine. The behaviour of the disease can vary considerably depending on which type of lymphocyte is involved and how quickly the cells are dividing. Owners often notice gradual weight loss, reduced appetite, or occasional vomiting that does not resolve with simple measures. Some cats develop diarrhoea or appear less interested in food over weeks to months. Because these signs overlap with many other digestive conditions, the picture at home may be unclear for some time before a pattern becomes apparent. This page explores what signs may be observed, what is happening at a cellular level in the intestine, how the condition is investigated through imaging and tissue sampling, and what treatment approaches exist. The aim is to help you understand the nature of alimentary lymphoma and the shape of the conversations that may follow.