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Meningitis is usually caused by bacterial, viral or fungal infection, but may also result from injury, cancer, or drugs (e.g., NSAIDs, trimethoprim/sulphamethoxazole, amoxicillin or ranitidine). Classic symptoms of meningitis include headache, nausea or vomiting, neck stiffness, and fever. Each subtype also has its characteristic risk factors, signs, and symptoms.