Meningitis. Medically speaking, meningitis is an inflammation of the membrane that protects the brain, and this is, obviously, usually a fatal condition. This is a common symptom of Lyme disease, and in this case, the meningitis is, curiously enough, very mild. Most patients who develop meningitis as a symptom of Lyme disease can be treated as out-patients, that is to say, the symptom is mild enough to not make hospitalization mandatory. Standard symptoms of meningitis include a splitting headache, or pain around the areas of the back or the spinal column, and of the neck. A fever can also be a symptom, as can vomiting, or an inability to see clearly.