Meningitis is predominantly an inflammation that occurs in the meninges and can extend to the brain parenchyma. It is generally caused by pathogenic microorganisms, including common pathogens such as bacteria, fungi, viruses, tuberculosis bacteria, etc. The most common symptoms include fever, headache, nausea, vomiting, stiff neck, etc. More severe cases can present with convulsions, disturbances of consciousness, or even coma. The condition can be mild or severe, and if not treated promptly, it can be fatal in serious cases.