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 pain, weakness, or problems with coordination. Common examples include Alzheimer's disease, Parkinson's disease, and multiple sclerosis. The causes of nervous system disorders can vary widely, including genetic factors, infections, and environmental influences. Diagnosis often involves neurological examinations, imaging tests, and sometimes laboratory tests. Treatment options may include medications, physical therapy, and lifestyle changes to help manage symptoms and improve quality of life.