There are many causes of dizziness and weakness of the legs, which are broadly classified as follows: 1. hypertension, long-term hypertension atherosclerosis, resulting in insufficient blood and oxygen supply to the brain, prone to dizziness, accompanied by weakness and weakness of the legs, it is recommended to control blood pressure. 2. hypotension, insufficient perfusion of blood to the brain, cerebral ischemia, hypoxia, resulting in dizziness, nausea, weakness and other symptoms. 3. Long-term insomnia, which can lead to dizziness, headache, lack of concentration, sleepiness and weakness of the limbs, etc. It is recommended to regulate work and rest.4. Cerebrovascular disease, if a middle-aged adult with hypertension, diabetes, or smoking, alcohol consumption, obesity, hyperlipidemia and other pathogenic factors, dizziness, weakness of the legs and other symptoms, consider whether there is the occurrence of cerebrovascular disease, it is recommended to go to the hospital for relevant examinations, such as head CT or magnetic resonance, Vascular ultrasound, etc. Other causes, such as hypoglycemia and anemia, can cause dizziness and weakness.