... to prevent migraine and neck vacant, strong pressure to support the neck in line with the body's natural bent.Detailed ... types of cervical disease (cervical bone hyperplasia, cervical curve changes in physiology, spinal stenosis, cervical type, nerve root, vertebral artery ... ) have a special effect.3. And for the high blood pressure, headache, dizziness, tinnitus, stroke sequelae, shoulder, hair loss, ...