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, ...

Tweaked by a muscle twitch? From an uncontrollable fluttering eyelid to a pulsing calf muscle, these small, rapid involuntary muscle contractions may happen at any time -- and can be annoying. A ...

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 ...

Eyebrow twitching is a type of muscle spasm. Many things can cause spasms, and they may be a sign of a medical condition that needs treatment. Muscle twitches or spasms are involuntary movements that ...

Have you ever felt your eyelid suddenly flutter or twitch uncontrollably? This common annoyance, called eye twitching (or myokymia), is usually harmless and fades quickly. But when it persists, you ...

Eyebrow twitching can be caused by everyday things that might include caffeine, stress, and eyestrain. Muscle spasms or twitching may also be a sign of an underlying condition, such as Bell’s palsy or ...

Add Yahoo as a preferred source to see more of our stories on Google. Though eyelid twitching (technically called myokymia) can feel disconcerting, the good news is that it’s typically fleeting and ...

Some suggest that there may be a link between eye twitching and headaches. Many things can cause eye twitching and headaches, such as migraine, fatigue, and stress. Eye twitching is when a person’s ...