Meningitis is an inflammation of the meninges, the membranes that cover the brain and spinal cord, usually due to the spread of an infection. The cause of most cases of meningitis is a viral infection, but bacterial and fungal infections also can lead to meningitis. It may be rarely due to chemical irritation, drug allergies, and tumors. People with weakened or suppressed immune systems also are at higher risk of developing maningitis.

The patient usually begins to feel vaguely unwell and may develop headache and fever. In later stages, the patient may have neck and back stiffness, severe headache, and drowsiness.They may also have diarrhea, vomiting, rashes, seizures, rapid breathing and confusion may occur. Bacterial meningitis is more serious than viral meningitis and is most often a medical emergency.

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