Ticks are defined as sudden, unwanted, repetitive, gestures or expressions. The following are types of ticks: blinking eyes, crinkling face, turning neck, bracing mouth, clearing throat, clearing nose, grunting, touching, sniffing, fixing appearance, repeating certain expressions/gestures or the last heard sound/expression. The frequency and severity of the ticks may show different course of repetition within the same person; the same tick may be done more or less within time and sometimes the tick might change with another one or one tick may be followed by others.