... intense, severe muscle spasms that may begin at foot or ankle, and completely encases leg up to top of thigh, by winding up in a circular motion, affecting only one leg, and pattern may be reversed, ie beginning at top of thigh and winding down? May last a number of minutes, pain so severe it's almost difficult to breathe, no interventions appear to decrease or stop process, resolves spontaneously, and occurs randomly and spontaneously-may be weeks or months between episodes, occurs either leg, but not both legs at same time.