Brain infections are usually caused by bacterial, viral, fungal, or parasitic pathogens often involving the tissue of the brain itself or the membranes surrounding the brain and spinal cord (meninges). Bacteria and viruses are the most common causes of brain infections seen in clinical practice. An abscess located in brain is a localized collection of infectious organisms along with inflammatory cells invasion. They are also Signs and symptoms of a brain infection usually depend on extent of involvement or the type of infection. Mostly, viral meningitis usually causes much milder symptoms than bacterial meningitis, which can be fatal. Symptoms associated with bacterial meningitis can include severe headache, neck stiffness, high grade fever, nausea, vomiting, or discomfort when looking at bright lights, confusion and viral meningitis usually present with previously mentioned symptoms along with seizure like activity.