The sudden inability to move the lower limbs may be caused by the following aspects: 1. It may be caused by low potassium, most commonly caused by people who sweat too much in summer, or people with acute gastroenteritis, abdominal pain, diarrhea, vomiting more, resulting in potassium loss, low potassium, resulting in a decrease in muscle strength of the limbs, the phenomenon of sudden inability to move the lower limbs. 2. It may be caused by cerebrovascular accidents, common This is an acute cerebral infarction or acute cerebral hemorrhage, which is usually unilateral inability to move the lower limbs, and also accompanied by unilateral decrease in muscle strength of the upper limbs. 3, may be caused by lumbar spine disease, sudden lumbar disc herniation compression of the spinal cord, there may be numbness and weakness of the lower limbs, resulting in sudden inability to move.