How do cats itch from fleas? - briefly
Cats itch from fleas due to the irritation caused by flea bites and the allergic reaction to flea saliva, which triggers intense scratching and discomfort.
How do cats itch from fleas? - in detail
When cats experience fleas, the itching sensation is primarily caused by the fleas' feeding behavior and their saliva. Fleas are parasitic insects that bite the cat's skin to feed on its blood. During this process, they inject saliva into the skin to prevent blood clotting, which allows them to feed more efficiently. The proteins and enzymes in flea saliva are foreign substances to the cat's body, triggering an immune response. This immune reaction leads to inflammation and the release of histamines, which are chemicals that cause intense itching and irritation. Cats scratch, bite, or lick the affected areas in an attempt to alleviate the discomfort. The scratching can further damage the skin, leading to secondary infections, redness, and hair loss. Some cats may also develop an allergic reaction known as flea allergy dermatitis (FAD), which amplifies the itching and skin irritation even further. In severe cases, the constant scratching and grooming can lead to open sores, scabs, and significant discomfort for the cat. Regular flea prevention and treatment are essential to minimize these symptoms and protect the cat's health.