Left arm and left leg weakness: 1. The clinical symptoms may be caused by brain hemorrhage or brain tumor, cervical spondylosis combined with lumbar disc herniation. 2. The symptoms of left arm and left leg weakness may be caused by cerebral infarction. Therefore, in this case, the patient should rest in bed, avoid strenuous activities, and give appropriate conservative treatment. If the symptoms are not relieved within a short period of time, it is necessary to go to a regular hospital in time to do the corresponding examination and choose the appropriate treatment method after a clear diagnosis based on the results of the auxiliary examination and the clinical performance. If suffering from cervical spondylosis combined with lumbar disc herniation, patients should pay attention to more rest, keep the neck and waist relaxed, and relieve the symptoms by means of hot compresses, acupuncture and physiotherapy.