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 ...

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, ...

Most of us unwittingly fight or resist anxiety because it feels like an enemy, but mental health experts advise that treating anxiety as your friend, instead of your enemy, helps reduce it. You feel ...