Cat Behavioral Changes Symptoms

Lethargy in cats means being less active than usual, sleeping more, or losing interest in play. It is often an early sign of various underlying illnesses.

Hiding in cats — spending unusually long periods concealed and refusing to come out — is an instinctive response to feeling unwell and may signal illness.

Excessive grooming in cats involves repetitive licking of the same area or pulling out fur. Hair loss on the belly, inner thighs, or forelegs is a common result.

Aggression in cats — sudden biting, scratching, or threatening behavior — can be a sign of pain or illness, particularly when the behavior is a recent change.

Excessive vocalization in cats includes meowing more than usual, vocalizing loudly, or crying persistently at night. In senior cats, it may signal cognitive dysfunction or hyperthyroidism.

Cognitive dysfunction in senior cats (Feline Cognitive Dysfunction Syndrome, CDS) involves disorientation, forgetting litter box location, and nighttime wandering — similar to dementia in humans.

Stress signs in cats include a range of behavioral indicators such as hiding, reduced appetite, excessive grooming, and house soiling. Chronic stress can weaken the immune system and trigger cystitis.