Encephalitis

Medium urgency
-Moderately severe
Encephalitis is the inflammation of the brain. It is generally due to a viral infection but it can be produced by other causes. Most cases are mild and present as a flu with headache, but it may sometimes turn severe and leave the patient in a coma. It manifests with one or more of the following symptoms: sudden fever, intense headache that may be accompanied by a stiff neck, drowsiness or altered level of consciousness, convulsions, speech disruption, tremors, altered vision and/or hearing, vomiting, etc. It is diagnosed by means of a detailed clinical history and a complete physical examination. Additional tests will be required in many cases, including CT scan or a lumbar puncture. The vast majority of cases of encephalitis resolve spontaneously and require only symptomatic treatment. When the patient's general state of health is severely affected or suffers from confusion, agitation, or very severe headache, it may be necessary to admit them to the hospital for treatment and stabilization.
Bibliographic references
  1. Stephen J Gluckman. Viral encephalitis in adults. UpToDate Mar 21, 2016.
  2. Beattie GC, Glaser CA, Sheriff H, et al. Encephalitis with thalamic and basal ganglia abnormalities: etiologies, neuroimaging, and potential role of respiratory viruses. Clin Infect Dis 2013; 56:825.
  3. Tyler KL. Emerging viral infections of the central nervous system: part 1. Arch Neurol 2009; 66:939.
  4. Sonneville R, Klein I, de Broucker T, Wolff M. Post-infectious encephalitis in adults: diagnosis and management. J Infect 2009; 58:321.
  5. F Graus Ribas, J Gatell Artigas. Encefalitis y otras infecciones víricas del SNC. Farreras Rozman. Medicina Interna. Volumen 2. 12º edición. Pp1386:1388.
  6. Kareb L. Roos, Kenneth L. Tyler. Meningitis, encefalitis, absceso cerebral y empiema. Harrison. Principios de Medicina Interna. Volumen 2. 19º Edición. 883:906.
Author
Dr. Oscar Garcia-Esquirol
Copyright
© TeckelMedical 2026

Symptoms

    Diminished state of consciousness


    Neck stiffness


    Headache


    Neurological symptoms: impaired speech, physical strength or feeling


    Coma

Pre-hospital care recommendations

Take over-the-counter pain relievers or anti-inflammatories.
Use antiemetics if vomiting occurs.
Keep calm.
In case of convulsions, it is important to prevent the person from hitting their head. To do this, the person should be placed on their side and no object or hand should be placed in their mouth.