Adrenaline increases the "alertness" of the nervous system, meaning it's ready to trigger muscle contraction. It also increases the amount of blood flow and changes the tension of the muscles, which, ...

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 ...

This post was written by Chelsea Dale, M.S. Taylor’s mother noticed that her 8-year-old child was constantly sniffing but did not have a cold or allergies and was excessively blinking, head nodding, ...