Feline illnesses can cause abdominal pain with or without swelling, bad breath, blood in the cat's urine or stool, abnormal breathing, and chewing or licking the skin, according to WebMD. Choking and coughing are also common symptoms of feline illness.
Sphynx, Rex and Ragdoll cats are more prone to gastrointestinal disorders than other breeds, and these disorders can cause vomiting, regurgitation, flatulence, weakness, constipation and diarrhea. Acute gastroenteritis, colitis, pancreatitis, irritable bowel syndrome and small intestinal malabsorption are common gastrointestinal disorders, according to Hill's Pet.
Increased thirst, rapid weight loss, lack of energy, increased urination and vomiting are symptoms of feline diabetes mellitus. Burmese and overweight cats most commonly develop this condition, and although cats may develop the condition at any age, the peak onset is at age 8. Diabetes mellitus occurs when the cat's pancreas reduces insulin output, and an owner may manage the condition through diet, exercise or insulin injections, describes Hill's Pet.
Excessively licking or scratching the skin signifies parasites, allergies or dry skin. A cat may also lick or scratch a certain area on its body to indicate pain, according to WebMD. Some cats develop compulsive disorders that involve excessive licking or scratching after significant changes in their environment.