Numbness and weakness in the right leg can be caused by brain diseases, such as cerebral infarction, cerebral hemorrhage, transient ischemic attack, and intracranial occupational diseases. For intracranial diseases causing numbness and weakness in the right leg, the patient also has clinical symptoms of dizziness, headache, increased blood pressure, and numbness and weakness in the right upper limb, which can be diagnosed after CT and MRI examinations of the head. It can also be seen in the lumbar spine, with lumbar disc herniation leading to sciatic nerve compression, the patient can have numbness and weakness in the right leg, while patients with lumbar spinal stenosis can also have numbness and weakness in the right leg, and can also be accompanied by intermittent claudication in walking, the patient can be given CT or MRI of the lumbar disc, and the patient can be given physiotherapy, acupuncture, or surgery if necessary.