Are muscle spasms and/or pain normal in MND. I am at the early stages of MND and the worse symptom is weakness in my right leg and poor balance. My right leg seems to have worsened and I can't believe how tight the calf muscle now feels. It is also quite painful. At midday today I went back to bed for a rest. The pain stopped whilst lying down but I couldn't believe how extreme it was and the tightness when I got back out of bed.