A cramp is where the muscle tightens so much it feels like it’s stuck, and it hurts like heck!
A spasm doesn’t hurt as much (if at all) but the muscle throbs as if you are flexing and relaxing.
Skeletal muscle cramps can be categorized into four major types. These include “true” cramps, tetany, contractures, and dystonic cramps. Cramps are categorized according to their different causes and the muscle groups they affect