"acute cervical muscle sprain"

Woke Up and Cannot Turn Your Neck? Relieving 'Phlegm' Stagnation

Have you ever opened your eyes in the morning only to find your neck stiff and painful, making it impossible to turn your head to the side? You simply went to sleep and woke up, so finding yourself suddenly struck by phlegm (dam) can be bewildering, and that lingering discomfort throughout the day is something many know well.