There are two main reasons for dizziness when the head is lowered and the head is turned sideways: 1. Sympathetic cervical spondylosis, which is due to more inflammatory growths and lesions in the cervical spine, may stimulate the location of the lesions when the head is lowered and the head is turned sideways, resulting in increased inflammation and stimulating the peripheral nerves and sympathetic nerves to show sympathetic hyperactivity or inhibition, and dizziness may occur. 2, vertebral artery cervical spondylosis, this is due to the low head and side head, may produce extrusion stimulation of the vertebral artery, especially the hook vertebral joint, and vertebral artery foramen location has more inflammatory hyperplasia or calcified lesions, so that after stimulation of the vertebral artery led to tension or spasm of the vertebral artery, it may induce dizziness. This may induce dizziness, and in some cases, vertigo, nausea, and vomiting.