The causes of unsteadiness in standing on the right leg may be physiological or pathological, such as lumbar disc herniation and joint diseases. 1. Physiological: when over-exercise, it is easy for muscle fatigue to lead to a decrease in motor ability and balance, resulting in the symptom of unsteady standing. After drinking alcohol, alcohol has an effect on the nerve center, resulting in imbalance of balance, and unsteadiness will occur. 2. Herniated lumbar intervertebral disc: If the nucleus pulposus protrudes to the right, leading to pressure on the right side of the nerve root, it is easy to induce edema of the nerve root, and aseptic inflammation occurs, which will cause numbness of the right leg or even muscle atrophy in the long run, and lead to the instability of standing on the right leg. 3. Joint diseases: when arthritis or osteophytes occur in the big joints of the right leg, i.e. hip joint, knee joint and ankle joint, it will easily lead to joint pain and stiffness, inconvenient movement, difficult to complete single-leg support movement, and unsteadiness of the right leg. Unsteadiness of the right leg can also be caused by cerebellar infarction and otolithiasis. Physiologic right leg instability does not require special treatment, and symptoms are often relieved with adequate rest. If the right leg instability is caused by pathological factors, it is recommended that the patient go to the hospital in time to have the cause of the problem diagnosed and treated by a doctor.