Hyperesthesia syndrome, also known as feline hyperesthesia syndrome (FHS), is a condition in cats that causes increased sensitivity to touch or pressure, which can lead to severe pain or discomfort Cats with FHS may exhibit a variety of clinical signs, including: Tail thumping, Skin rippling, Hissing, Biting themselves or other cats or people, and Appearing shocked. The Spruce Pets Feline Hyperesthesia Syndrom.#pleasehelp#catmom