Walking and feeling weak and unsteady in the right leg may be caused by lumbar disc herniation, bone and joint diseases, cervical spondylosis, cerebrovascular diseases and so on. 1. Lumbar disc herniation: if the nucleus pulposus protrudes to the right side, it can compress the nerve root on the right side, resulting in edema of the nerve root and aseptic inflammation, which will cause pain and numbness of the lower limbs and muscle atrophy in a long period of time, and so there will be a phenomenon that the right leg is weak and unstable, and the severity of lumbar disc herniation can be clarified through the magnetic resonance imaging film, so that different treatments can be taken. 2. Bone and joint diseases: for example, degenerative osteoarthritis of the knee joint, when the joint deformation occurs, the lower limb force line changes can also appear this symptom, severe ischemic necrosis of the femoral head can also appear in the patient’s right leg weakness and instability. 3. Cervical spondylosis: Especially spinal cervical spondylosis compresses the spinal cord, which can cause weakness of walking legs, such as the feeling of stepping on cotton, and easy to fall. 4. Cerebrovascular disease: hemiplegia caused by cerebral infarction or cerebral hemorrhage can lead to weak and unsteady walking, which can be clearly diagnosed by cranial MRI film. Therefore, when you feel weak and unsteady in your right leg, you need to consider the above reasons and be alert to the possibility of other diseases, and you need to go to the hospital for examination and treatment in time.