Overview

Meningitis is an inflammation of the fluid and membranes (meninges) surrounding your brain and spinal cord.

The swelling from meningitis typically triggers signs and symptoms such as headache, fever and a stiff neck.

Most cases of meningitis in the United States are caused by a viral infection, but bacterial, parasitic and fungal infections are other causes. Some cases of meningitis improve without treatment in a few weeks. Others can be life-threatening and require emergency antibiotic treatment.

Seek immediate medical care if you suspect that someone has meningitis. Early treatment of bacterial meningitis can prevent serious complications.