The causes of lumbar muscle tremor when standing upright and inability to stand and walk include over-fatigue, motor neuron disease, etc. It is recommended to eliminate the disease through medication and general treatment. 1. Excessive fatigue: If you are engaged in physical labor or strenuous exercise for a long time, it will cause the muscles to contract and diastole repeatedly and rapidly. And when the activity is stopped, the movement of the muscles slows down, thus showing the phenomenon of upright lumbar muscle tremor and inability to walk. For this situation, you should pay more attention to pay more attention to, at the same time with a hot towel wet compress, to relieve. Secondly, we must do according to our ability, do not overdo the exercise, so as not to cause damage to the body. 2. Motor Neuropathy: When the lumbar motor nerve is damaged, it will involve the innervated abdominal muscles, and then appear upright when the psoas muscle tremor, can not stand and walk. In the face of this problem, you can follow the doctor’s instructions, the use of riluzole, edaravone, neurotrophic factor and other drugs for treatment, can play a delayed effect of the disease. There are many other causes of psoas fibrillation when standing upright, if this symptom occurs for a long time, you should go to the hospital as soon as possible for examination, do not take a chance.