Internal Parasites in Cats

1 Roundworms

Roundworms are pale yellow and infect both cats and people, making them a notable zoonotic risk. After infection a cat may vomit, sleep more than usual, gradually lose weight, and grow more slowly than expected.

A heavy load can block or telescope the intestine and even puncture it. If larval roundworms pass through the lungs, they trigger coughing and, in severe cases, breathing difficulty that amounts to a form of pneumonia. Roundworms directly interfere with a kitten’s growth and can be deadly in serious cases.

2 Hookworms

Hookworms are small, pale yellow thread-like worms. Infected cats become thin, their coat turns dull and starts to shed, and they show poor appetite, lethargy, and vomiting. Stools may contain blood and carry a foul, fishy odor.

If large numbers of hookworm larvae enter through the skin, the skin itself can become itchy and inflamed. Because hookworms feed on blood, anemia is a real concern, especially in kittens.

3 Filarial Worms

Filarial worms are long, pale, thread-like parasites. Early infection often shows up as a cough, which later progresses to an enlarged liver, fluid in the abdomen, and labored breathing. Left alone, the infestation can be fatal.

4 Tapeworms

Tapeworms, often Dipylidium, are pale reddish-yellow and live in the intestine. A serious infestation can cause intestinal blockage and anemia, with vomiting, diarrhea, chronic gut inflammation, and weight loss.

Mild infections are easy to miss. Check your cat’s stool or the area around the anus for small, rice-like segments, which are a clear sign of tapeworms.

5 Prevention Through Regular Deworming

The single most effective step is a consistent deworming schedule. Routine treatment prevents parasites from taking hold in the first place and protects both your cat and the people in your home.