Nervous system disorders are medical conditions that affect the brain, spinal cord, and nerves. These disorders can disrupt normal functioning, leading to symptoms such as weakness, pain, or changes in sensation. Common examples include multiple sclerosis, Parkinson's disease, and epilepsy. These disorders can arise from various causes, including genetic factors, infections, injuries, or environmental influences. Diagnosis often involves neurological examinations, imaging tests, and sometimes laboratory tests. Treatment options may include medications, physical therapy, or lifestyle changes, depending on the specific disorder and its severity.