Digestion in cats is quite interesting. Frequent vomiting is more common with cats than most other animals. Regurgitation is an effortless expulsion of undigested food - without wrenching. 
If your cat rubs its face with its paw, picks at its food, dribbles from the corners of its mouth, and has indigestion, you may guess pyorrhea. As pyorrhea develops the teeth are loosened and the gums become soft and inflamed. The mouth should be cleansed with an antiseptic solution and the ulcers painted, but a layman should not attempt to treat ulcers.
A cat with pharyngitis almost always coughs, especially when it tries to eat; but if the throat is very bad it refuses food, becomes very nervous, and hides away in corners. Keep the patient warm, coax it with soft nourishing foods, and pin a baby's wool sock snugly around the throat, with camphorated oil rubbed into the skin under it. Two per cent lime water is a good wash for a sore throat. Likewise you can give it  homeopet digestive upsets remedy
Gastritis, in cats usually comes from bacteria taken into the system with food that is not fresh. Cats get it from eating mice, or poisoned baits that have been put out for vermin. A distressing symptom of gastritis is thirst along with an inability to drink; the sufferer will sit by the water dish eyeing it longingly, or if it does drink or eat anything, up it comes directly, accompanied by froth. Cats lose strength fast in gastritis; the sooner the doctor is informed the better. Gastritis is inflammation of the stomach; enteritis is inflammation of the bowels. The cat's strength must be kept up with small doses of beef juice, rice water, barley water, milk, and white of egg in water. Plain dyspepsia often troubles cats fed not wisely but too well. You can easily do this with a soft rubber ear syringe, and if your pet has been properly trained to handling it will lie quiet on a rubber apron across your lap. Colitis, or inflammation of the lower bowel, is as painful to cats as to humans. Most veterinarians put the sufferer on a milk diet, and give enemas of starch or opium. Kittens are subject to colic, and occasionally adult cats have it too. Never neglect constipation. Refusal to eat, if persisted in, shows illness, except in the case of a homesick or grieving cat. It is hard to get a homesick cat to eat, and so it’s advisable to keep ill cats at home rather than in a hospital.
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