Meningitis:Inflammationof themeninges, the three membranes that envelop thebrainand thespinal cord.Meningitiscan be caused byinfectionbybacteria,viruses, andprotozoa. Other causes include cancer (metastasisto the meninges), inflammatory diseases, and drugs.Insome cases the cause of meningitis cannot be determined. The treatment depends on the cause of the meningitis.
