Cats experience excessive shedding for many reasons. Allergies and skin infections are among the most common, but thyroid and adrenal gland problems can trigger this problem. Some cats temporarily lose more fur during pregnancy due to hormonal shifts.
Parasitic infestations, including fleas and ringworm, may cause excessive shedding in cats. Stress can prompt cats to overgroom, which may lead to skin irritation and bald spots. Cats with poor diets may shed more because they lack the nutrients to support healthy skin and coats. Talk to your vet if you notice your cat experiencing fur loss or other skin problems.