(1) Idiopathic twitch: It is actually a muscle twitch of the throat. When the muscles in these parts contract and twitch, they will make sounds such as "Oh, Oh, Ah", which can also be manifested as clearing the throat, coughing, smelling, spitting and screaming.

(2) Exercise twitch: involuntary, sudden and rapid contraction of the muscles of fingers, face, neck and shoulders, trunk and limbs, manifested as blinking, frowning, pouting, nose shrinking, tongue stretching, mouth opening, shaking head, nodding, neck stretching, shoulders shrugging and chest hugging.

(3) Foul convulsion: uncontrollable swearing, spitting and animal barking.