What Causes Abdominal Distension in Cats?
📝 Summary
Abdominal distension in cats can signal anything from benign indigestion to serious congenital defects such as anal atresia or polycystic kidney disease. Dietary causes include spoiled ('toxic') milk from an infected queen, while parasites, infections, and simple digestive upset are common culprits. Because bloating ranges from mild to life-threatening, prompt deworming, probiotics, or a veterinary diagnosis is essential.
1 Genetic and Congenital Causes
Abdominal distension can stem from genetic disease. Anal atresia—where the anal opening fails to form—prevents defecation and is generally untreatable. Some intestinal diseases can suddenly narrow the bowel, also causing bloating. Congenital kidney defects such as hydronephrosis and polycystic kidney disease can swell the abdomen and require a veterinarian’s confirmation.
2 Dietary Factors
Healthy queen’s milk matches a kitten’s nutritional needs, so newborns rarely bloat from it. But if the mother has an infection, her milk can spoil; mastitis or uterine infection can cause ‘toxic milk syndrome,’ leading to kitten diarrhea and redness and swelling around the anus. To prevent post-weaning bloating, feed kittens low-carbohydrate canned food or meat.
3 Bacterial, Viral, and Parasitic Causes
A newborn’s gut is initially sterile, but contact with the mother’s mouth or feces can introduce bacteria, viruses, or parasites that damage the intestines. A heavy parasite burden causes obvious abdominal swelling—deworm promptly, as it can otherwise threaten the kitten’s life.
4 Indigestion
Bloating may also come from indigestion. Undigested food lingers and accumulates in the gut, killing the cat’s appetite and dampening its energy. Give digestion aids or probiotics to settle the stomach.
5 When to Seek Veterinary Care
Abdominal distension ranges from mild to serious, and cats with difficulty defecating are especially prone to it—take this seriously. Consult a veterinarian if you have further questions.
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