The slowing down of blood flow in both vertebral arteries may be caused by irregular living habits, vertebral artery compression, atherosclerosis, etc. It is recommended that the patient consult a doctor in time. 1. Irregular living habits: slowing down of blood flow in both vertebral arteries can occur when you stay up late at night or when you are overly nervous, and is accompanied by symptoms of insufficient blood supply to the brain such as dizziness and headache. 2. Vertebral artery compression: if the patient suffers from cervical disc herniation, cervical osteophytes, local edema, resulting in cystic compression of the vertebral artery, which will lead to slowing down the blood flow of the vertebral artery on both sides. 3. Atherosclerosis: If the patient suffers from hyperlipidemia or hypertension, it can lead to vascular sclerosis, which can also lead to the symptoms of slowing down the blood flow of vertebral artery on both sides. Slowed blood flow in both vertebral arteries can also be caused by other reasons, it is recommended that patients go to the hospital in time for examination, and can be treated under the guidance of the doctor.