Hello: Because the atlanto-occipital joint can do great flexion and extension along the sagittal plane, the posterior atlanto-occipital fascia is easy to be pulled, especially when working at a desk for a long time and sleeping in a high pillow, which will cause accumulated strain. In order to resist abnormal traction, the atlanto-occipital fascia is secondary to fibrous hyperplasia, scarring and contracture, which leads to narrowing of the atlanto-occipital space, compression of vertebral artery and traction of the greater and lesser occipital nerves. Clinical manifestations: 1. Stretching of occipital nerve and nuchal fascia, intractable pain and numbness in occipital region, overwork and wet and cold invasion can all aggravate the condition. 2. Vertebral artery compression, insufficient blood supply to the brain, persistent dizziness, decreased vision, and headache caused by spasm after vascular ischemia. Small needle knife treatment can relieve contracture, and the effect of manual correction is obvious. It is the best way to treat this disease at present, and I hope it can help you.