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, ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. A muscle spasm, also known as a cramp, twitch or charley horse, is the sudden and involuntary forced contraction of a muscle.

MICKLETON, N.J. (WPVI) -- Nearly everyone gets a muscle cramp from time to time. When muscle contractions won't stop and can't be controlled, that's called dystonia. A South Jersey man is now sharing ...

Hot and humid climates are particularly conducive to muscle cramps. Studies suggest that athletes, like Sinner, who compete in such conditions are at a higher risk due to the increased sweat loss and ...

Tardive dyskinesia and dystonia are both neurological disorders that can affect your muscles and cause involuntary muscle contractions. Tardive dyskinesia, which is usually a side effect of some ...

Muscle cramps are sudden, involuntary contractions that can cause sharp, intense pain lasting from a few seconds to several minutes. They often strike during exercise, dehydration, or even while ...

Clonus reflex is a set of rhythmic, involuntary muscle movements. It is a neurological condition that affects the nerve cells that control muscle movements. Damage to the nerves, as in clonus, causes ...

At one point or another, we’ve all experienced the unexpected, intense pain of a muscle cramp. Muscle cramps, also known as muscle spasms or charley horses, are the involuntary contraction of muscle ...

When we think of movement disorders, the tremors associated with Parkinson’s disease are probably what first spring to mind. However, there are other equally debilitating and much less well-known ...

From 2000 to 2005, a neurological disorder gradually twisted Leslie Harrell's body. Her head was bent over to her left shoulder, and the top half of her body was pulled down to her left hip. Dystonia ...