What about the alarming signs? It is not that difficult to define the signs as the patient of any type can feel it. Most people describe the feelings associated with myoclonus in the same way: cramps, quick or long-lasting spasms, shaking, etc. to be more specific, these attacks can be best characterized as short, unexpected, unintentional, shocking, unstable, and occur in different parts of the body in the areas with muscles. Even though it is not a serious diagnosis or a separate disorder, myoclonus may be rather severe. It may affect the way individual talks, eats or moves.