What deficiency causes muscle stiffness?

Neck Stiffness or Stiff Neck is quite a common condition and normally is quite a benign one but this condition is definitely quite annoying and painful. The pain and stiffness generally becomes better over a period of a few days and is normally not a sign of a potentially serious neck disorder or any underlying condition. An individual can develop a painful neck or stiff neck can by sleeping in the wrong position or using a computer for extended periods of time. http://www.epainassist.com/back-p