Cancer in cats is the leading cause of death among cats. It is caused by uncontrolled cell growth, and affects a wide range of cell types and organs in the body. Feline cancer initially manifests as a lump or bump on any parts of the body. It rapidly grows in the affected cell; attaches itself to the tissue under the skin in that area; and, depending on the tumour, it can spread to other parts of the body. Although cancer accounts for approximately 32% of deaths in cats over ten years old, it can be successfully treated if diagnosed early. While the causes of cancer in cats are unknown, feline leukemia virus is suspected to be a prime contributor. Other factors suspected to increase rates of feline cancer include toxins from the environment, passive smoking, excessive grooming, or licking parts of the body that have been in contact with an environmental toxin. Cancer can be detected at an early stage by observing certain signs and symptoms. Common diagnostic methods include physical examination, x-rays, ultrasounds, cytology, blood tests, urine tests, and nuclear scans. Depending on the type of cancer and its level of progress, surgery, radiation, chemotherapy, or immunotherapy may be used to treat the cancer. Although research into causes and treatment of feline cancers has been slow, there have been advances in radiation therapy, as well as newer and improved chemotherapy procedures. Signs and symptoms Cancer in cats can occur in any location or body system, and most symptoms can be detected externally. While each type of cancer has its own distinctive symptoms, most indicate their presence by the occurrence and the prolonged presence of any common symptom. Some of the general symptoms of cancer in cats are: Any lump that changes shape or size Any sore that does not heal Change in bowel or bladder habits Difficulty eating or swallowing Difficulty urinating or defecating Unexplained bleeding or discharge from body Loss of appetite Chronic weight loss Coughing or difficulty breathing Stiffness Oral odor Ravenous hunger. Lymphoma and lymphosarcoma Lymphoma is the most common form of cancer in cats, which is often associated with feline leukemia virus, and accounts for 25 percent of all cases. Feline lymphoma usually strikes the digestive system, causing excessive vomiting and diarrhea. Other common symptoms of lymphoma in cats include swollen lymph nodes, loss of appetite, weight loss, and difficulty breathing. Lymphoma and lymphosarcoma is