Neck pain after waking up usually has the following factors: 1. The most common factor is cervical spondylosis, when people sleep, especially patients with a past history of cervical spondylosis, cervical spine, intervertebral discs are particularly prone to compression or bulging, with herniated and bulging intervertebral discs in the cervical spine from section 2 to section 7 are more common, and when waking up will mainly compress the blood vessels and nerves in the neck, so you will feel neck pain after waking up. 2. The neck pain after waking up is also often associated with periarthritis, which is called the falling pillow after waking up, because the shoulder joint is misaligned due to periarthritis pain, or the surrounding trapezius and latissimus dorsi muscles are stretched and cause pain. 3, the neck pain after waking up is also associated with inadequate blood supply to the cerebral arteries, and the neck pain after waking up occurs when there is insufficient blood supply to the cerebral arteries, especially the vertebral basilar artery.