Meningitis

ARTICLE SECTIONS

Introduction Signs and symptoms Causes Risk factors When to seek medical advice

Screening and diagnosis Complications Treatment Prevention

Introduction

Meningitis is an inflammation of the membranes (meninges) and cerebrospinal fluid surrounding your brain and spinal cord, usually due to the spread of an infection.

In the past, most meningitis cases occurred in children younger than 5 years. But as a result of the protection offered by current childhood vaccines, most meningitis cases now occur in young people between the ages of 15 and 24. Older adults also tend to have a higher incidence of meningitis than do young children.

The cause of most cases of meningitis is a viral infection, but bacterial and fungal infections also can lead to meningitis. The severity of the inflammation and the best treatment depend on the cause of the infection. Bacterial meningitis is generally much more serious than viral meningitis, and timely treatment is necessary.

Left untreated, bacterial meningitis can be fatal. If you suspect that you or someone in your family has signs or symptoms of meningitis, seek medical care right away. There's no way to tell what kind of meningitis you have without seeing your doctor and undergoing testing.

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Signs and symptoms