You're relaxing on the sofa when suddenly your eyelid starts twitching. Or perhaps it's a muscle in your arm, your leg, or ...

Eye twitching may be a physical reaction, but many traditions view it as an intuitive or energetic signal. It reflects inner ...

Tic disorders are conditions featuring sudden, non-rhythmic movements or vocalizations. A formal tic disorder diagnosis is determined by tic frequency, duration, and type. Tics are non-rhythmic ...

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 ...

Obsessive-compulsive disorder (OCD) is a mental health condition that involves repetitive thoughts and behaviors. If you have OCD, you might also experience tics or disruptive involuntary sounds or ...

Billie Eilish has Tourette's syndrome, a brain disorder characterized by repetitive and involuntary sounds and motions. The singer spoke about her tics in a recent interview with David Letterman. She ...

Infectious agents can cause muscle twitching and spasms, too. The most commonly known is probably tetanus, which causes a phenomenon called lockjaw, where the neck and jaw muscles contract to the ...