DefinitionMeningitis occurs when the lining of the brain and spinal cord (meninges) becomes inflamed. Cerebrospinal fluid (CSF), a clear fluid that surrounds and protects the brain and spinal cord, has an increased number of white blood cells. Aseptic meningitis occurs when there are signs of meningitis without an identifiable disease-causing agent.
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CausesThe most common causes of aseptic meningitis are:
- Viral infections:
- Bacterial infections, such as tuberculosis
- Parasitic infections, such as Lyme disease
- Mycoplasma, an usual bacteria that can cause pneumonia
- Partially treated bacterial meningitis
- Autoimmune disorders, such as systemic lupus erythematosus or sarcoidosis
- Cancer that has spread to the meninges
- Certain medications
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