Hello: According to your description, it may be caused by cervical spondylosis, but it may also be caused by scapulohumeral periarthritis. The specific diagnosis depends on some examination results. Besides, you have too much phlegm, which should be a respiratory or lung problem. Relevant inspection is recommended.

Suggestion: cervical examination should be done first, and it is best to do cervical magnetic resonance examination to see if there are any problems such as cervical disc herniation or cervical spinal canal stenosis; In addition, you can also take an X-ray of the shoulder joint to see if there is any disease in the shoulder joint, and then take a chest film to see if there is any problem in the lungs.

Changing posture regularly at work and doing gentle neck movements and upper limb movements are conducive to relaxing shoulder and neck muscles and improving blood circulation. It is best to sleep on a flat bed with a suitable pillow height to prevent the head from overstretching or overstretching.