Cramping is another early common sign and the result of both muscle fatigue and general nerve impulse problems. These cramps can sometimes be quite mild but in most cases extremely painful. They can occur all over the body but will most commonly occur in the arms, chest, back, legs and abdomen. The neck and jaw are also commonly affected by muscle cramps, making it difficult to move and talk.
Over time the cramping becomes less painful, but this isn’t necessarily a good thing given that the muscles have begun to weaken.
When you do experience cramping, it will probably last for around an hour or more, and will be more likely to occur if you are cold or have been exercising.