The common parasites
Cats can be affected by both internal and external parasites, and it helps to know the usual suspects. Internally, various worms can live in the gut, while externally the most common visitors are fleas, ear mites, and ticks. Fleas cause itching and can lead to skin problems and worms, ear mites cause dark debris and head shaking, and ticks attach to the skin and can carry other diseases. None of this means your cat is neglected, as even the best-cared-for cats meet parasites. The reassuring part is that these are common, well-understood, and very manageable.
Signs to look for
Parasites can be quiet, but there are signs worth noticing. Scratching, over-grooming, tiny dark specks in the fur, or a cat nibbling at its skin can point to fleas. Worms may show up as changes in appetite or weight, a dull coat, or occasionally visible segments near the tail or in the litter box. Frequent head shaking or dark waxy buildup in the ears can suggest ear mites, and ticks are usually felt as small lumps on the skin. If anything looks off, a vet can quickly work out what is going on.
Indoor cats are not immune
It is a common myth that indoor cats cannot get parasites, but they certainly can. Fleas and their eggs can hitch a ride indoors on clothing, on other pets, or through open doors and windows. Some worms can be picked up from the environment or from hunting the occasional insect that wanders inside. This is why prevention is worth thinking about even for cats that never set a paw outside. An indoor lifestyle lowers the risk but does not remove it entirely.
Routine prevention and deworming
The simplest approach is regular, planned prevention rather than only reacting when a problem appears. Your vet can recommend a suitable deworming schedule and flea and tick products matched to your cat's age, weight, and lifestyle. It is important to use products chosen with veterinary guidance, because some over-the-counter or dog products can be unsafe for cats. A steady routine keeps most parasites from ever getting a foothold and protects the whole household. If you are unsure what your cat needs, a quick conversation with your vet will set you on the right track.