It is caused by bacteria and is a life-threatening condition that requires immediate medical treatment.
Bacterial meningitis affects more men than women.
At highest risk are the elderly, children under age 5, and people with chronic illnesses. Bacterial meningitis is caused when blood from an infected area in another part of the body carries bacteria to the brain and spinal cord. Bacteria can also enter the brain when you have an ear or sinus infection, or after a skull fracture. Infants who are 1 month old or younger, children, and the elderly may not have the typical symptoms of bacterial meningitis. The doctor will review your symptoms, ask about your medical history, and examine you.