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

ADHD and tics are separate but closely related conditions. About one in five people with ADHD also have a tic disorder. Jump to Key Takeaways. Tics are sudden, repetitive actions that people cannot ...

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 ...