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, ...

It may start as something we’re all familiar with: tiny spasms around your eyelid. “When you’re tired or stressed and you get fluttering under your eye or eyelid and it’s really annoying,” says Sharon ...

Though many people experience muscle twitching, it's often incorrectly identified as a muscle spasm. While both are involuntary contractions of a muscle, muscle spasms and muscle twitching aren't ...

Eye twitching is usually harmless and triggered by stress, fatigue, screen strain, caffeine, or dry eyes. Here are some common causes, simple fixes, and when persistent twitching needs medical ...

After undergoing six root canals over the years, Tippy McInerny wasn’t surprised when her dentist gave her several shots of a local anesthetic and stretched her mouth open for more than an hour while ...

Subtle twitching in any part of the body is a very strange sensation and especially so when it's your lips that are twitching. While it’s usually harmless, a twitching lip can be very annoying. Often, ...