Spasms like this occur in some people with some regularity (I am one such person) my Doctor as well as a family friend who is a physician told me they are muscle spasms. And they feel and spasm differently than a muscle spasm in more common places because it is a different type of muscle. Skeletal versus Smooth. Still it should be shown to a qualified health practitioner in case there is an underlying cause or misinterpretation of the type of "spasm" you may be experiencing.
Tetanus.
Overstretching of a muscle initiates a stretch reflex spasm where the muscle spindle cells relay a message to the spinal cord, and an efferent message is sent to motor units to contract the muscle, thereby causing a muscle spasm.
cardiac and smooth
The medical term meaning spasm of the esophagus is known simply as "esophageal spasm." Doctors don't know why some people suffer with these spasms but treatment methods include nitroglycerin, anti-depressants, and in rare cases, surgery.
carpopedal spasm are spasm of the hand or foot, or of the thumbs and great toes.
Spasm - album - was created in 1993.
Cytoplasm rhymes with spasm.
Muscle spasm
My hand just had a spasm!
As he fell, he could feel a spasm in his back.
Yes. Esophageal spasm is a known medical condition.
Antonyms of spasm would be calm, relaxed, still.