Dizziness and weak legs should be alert to cerebrovascular disease, cervical spondylosis, colds and so on. 1. Cerebrovascular diseases: many kinds of cerebrovascular diseases including cerebral infarction and cerebral hemorrhage may cause dizziness and weak legs, in addition, some patients may also have symptoms such as elevated blood pressure and sensory impairment. 2. Cervical spondylosis: When spinal cervical spondylosis occurs, there are symptoms of dizziness and weakness of the lower limbs, which may be accompanied by numbness and pain in the lower limbs, as well as a feeling of cotton when walking. 3. Cold and flu: patients with cold and flu can have symptoms such as dizziness and weakness of limbs, so they also need to be vigilant. In addition, low blood pressure, low blood sugar, low blood potassium and other conditions will also appear the symptoms of weakness of the legs. When there is dizziness and weak legs, you should go to the regular hospital in time to clarify the cause of the disease and follow the doctor’s instructions for treatment, so as not to delay the condition.