Dizziness and lightheadedness may be related to factors such as insufficient blood supply to the brain, neurasthenia, anemia, cardiovascular disease, cervical spondylosis, high blood viscosity. 1. Insufficient blood supply to the brain: insufficient blood supply to the brain caused by dizziness is mainly due to atherosclerosis, resulting in vertebral – basilar artery blood supply obstacles caused by dizziness, nausea and other symptoms, but also may be accompanied by a side of the limb ataxia, motor sensory deficits and other symptoms. 2. Neurasthenia: prolonged sleep deprivation or mental stress may lead to neurasthenia, resulting in headache, dizziness, autonomic dysfunction. 3. Anemia: anemia can lead to a decrease in the oxygen-carrying capacity of the blood, leading to cerebral ischemia and hypoxia, dizziness symptoms. 4. Cardiovascular diseases: Some cardiovascular diseases, such as high blood pressure, low blood pressure, etc., can cause dizziness, often accompanied by cardiac discomfort. 5. Cervical spondylosis: due to long-term posture or poor sleeping position, resulting in cervical spine hyperplasia, deformation, degeneration, neck muscle tightness, arterial blood supply is blocked so that insufficient blood supply to the brain, which is the main cause of dizziness. 6. High blood viscosity: hyperlipidemia, thrombocytosis, etc. can increase blood viscosity and slow blood flow, resulting in insufficient blood supply to the brain, which is prone to fatigue, dizziness, fatigue and other symptoms. Dizziness is related to many factors. When dizziness occurs, it is recommended to go to the hospital for examination and treatment in time so as not to delay the condition.