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Definition
By Mayo Clinic staffMeningitis is an inflammation of the membranes (meninges) and cerebrospinal fluid surrounding your brain and spinal cord, usually due to the spread of an infection. The swelling associated with meningitis often triggers the "hallmark" symptoms of this condition, including headache, fever and a stiff neck.
Most cases of meningitis are caused by a viral infection, but bacterial and fungal infections also can lead to meningitis. Depending on the cause of the infection, meningitis can resolve on its own in a couple of weeks — or it can be a life-threatening emergency.
If you suspect that you or someone in your family has signs or symptoms of meningitis, seek medical care right away. Early treatment can prevent serious complications.
