First Learn about stiff necks!
A stiff neck, fatigue substances such as lactic acid accumulate in the muscles, shoulder muscles stiffness, of Arc, I say that the symptoms that heavy feel. Cause of stiff neck, the poor posture, lack of exercise, stress, cold, menopause, are considered and visceral disease. In particular, it is said to be prone to stiff neck when has continued for a long time the same posture, such as desk work.
To eliminate the stiff neck is, or loosen the muscle massage and acupressure, which has become stiff, it is effective to go stretch the muscle stretch.