The numbness of the right leg may be caused by physiological factors, or it may be caused by lumbar intervertebral disc herniation, cerebrovascular disease, and so on. 1. Physiological factors: If the right leg is pressurized for a long time, such as sitting cross-legged, the right leg may become numb due to the influence of local blood circulation, which can be relieved after relieving the pressure. 2. Pathological factors (1) Herniated lumbar intervertebral disc: the sensory nerves innervating the right leg are issued from the lumbar vertebrae, so if you suffer from herniated lumbar intervertebral disc, it is possible to press the nerve root, causing numbness of the right leg, and sometimes it may be accompanied by pain. (2) Cerebrovascular disease: including cerebral infarction, cerebral hemorrhage, may appear on the side of the limb numbness and weakness, may be accompanied by dysarthria, choking on water and other symptoms. There are many causes of numbness in the right leg, which need to be combined with the accompanying symptoms of the patient, improve the relevant examination, and then systematic treatment under the guidance of the doctor after the cause of the disease is clarified.