Differentiation Main Manifestations:Most patients feel neck rigidity and muscular soreness and pain early in the morning.They have limited movement with difficulty in turning from side to side.The pain may also radiate towards the shoulder and arm.Differentiation ⚫ Main Manifestations:Most patients feel neck rigidity and muscular soreness and pain early in the morning. They have limited movement with difficulty in turning from side to side.The pain may also radiate towards the shoulder and arm