DEAR HARRIETTE: Since I was young, I’ve found that I’ve always had strange anxiety-induced habits — pulling at the edges of my hair, sucking my thumb, picking at scabs, etc. Over time, I’d find a ...

“Tics wax and wane. It’s just the nature of the beast.” Or is it? Some experts are beginning to believe that the waxing and waning effect is not random but is instead related to environmental ...

Motor tics are spasmodic contractions of muscles, which typically involve the face and are habitual. Examples include squinting the eyes, grimacing, or even turning the head. Sometimes motor tics ...