The causes of dizziness with weak legs are as follows: 1, dizziness accompanied by nausea and vomiting can cause electrolyte disorders in the body and imbalance of acid-base balance; 2, after sudden dizziness, mood anxiety and tension make blood pressure rise, blood pressure rise after insufficient blood supply to the limbs and insufficient blood supply to the heart muscle, causing dizziness with weak limbs, dizziness can be accompanied by changes in plant nerve function, releasing many hormones, causing the body to protect itself and a series of discomfort; 3, other causes, such as Meniere’s disease, posterior circulation ischemia, benign position vertigo, mental factors, psychological factors.