A stiff neck is a very common condition. It can keep you from turning your head comfortably or cause a lot of pain when you are at work. Often times stiffness in the neck can lead to headaches in the back of the head. There are several causes of a stiff neck. It is important to find out what is causing the neck tightness so that you can address the issue at its source and get lasting relief. Watch this video below to find out what can cause a stiff neck.