To determine if a cat has fleas, you can observe the following aspects:
Observe your cat's behavior: Fleas can cause itching and discomfort in cats. Therefore, if your cat frequently licks, bites, scratches, or constantly scratches itself, it may be because of the presence of fleas.
Check your cat's fur: Fleas are very small and often hide in a cat's fur. Pay special attention to areas where fleas tend to hide, such as the back, abdomen, and base of the tail. You can carefully observe whether you can see fleas or their droppings (black flea feces).

To look for signs of fleas: Gently wipe the cat's fur with a white tissue or damp cloth. If black flea droppings or red bloodstains (flea bites) appear on the tissue, the cat may have fleas.
Check your cat's skin: Carefully examine your cat's skin for redness, inflammation, or skin lesions caused by flea bites.