Well explicatico. Doctor I've been experiencing something that is bothering me a lot. I feel a fatigue in neck tension No pain. And with stiffness when I turn the neck. E type snap like sand. And now in the left jaw stiffness when I move my mouth. Horrible. I took the heart. Complete blood ultrason thyroid. All I did also normal x-ray of the chest. All normal. Help me. I will be very thankful. I'm 40 years old.