what disease is when your muscles tightening
Signs and symptoms of spasticity include: 1  muscle tightness. 2  joint stiffness. 3  involuntary jerky movements.  exaggeration of 1  reflexes. unusual posture.  abnormal positioning of fingers, wrists, arms, or 1  shoulders. muscle spasms.  involuntary crossing of the legs, called scissoring because the legs cross like the tip of a pair of scissors.