The Central nervous system is the part of the nervous system consisting of the brain and spinal cord. It is referred as central because it combines information from the entire body and coordinated activity over the whole organism. CNS disorders can affect either the brain or the spinal cord which conclusion in psychiatric disorders or neurological disorders. The causes of CNS diseases are the neurology, trauma, autoimmune disorders, infections, structural defects, degeneration and tumours. So here we target on mood disorders, neurodegenerative diseases, schizophrenia and autism. Meningitis is an almost rare infection that affects the delicate membranes called meninges that cover the brain and spinal cord. By infection or allergic reactions, inflammation of brain occurs, it is known as Encephalitis.