Severe Headache with Systemic Infections

Immediate Life-Threatening Causes to Rule Out

The combination of severe headache, chills, and night sweats represents a medical emergency requiring immediate evaluation for life-threatening infectious causes, particularly bacterial meningitis, viral encephalitis, and systemic infections with CNS involvement, as recommended by the Centers for Disease Control and Prevention 1, 2
Bacterial meningitis is characterized by a classic triad of severe headache, fever with chills, and nuchal rigidity, with diagnostic approach including lumbar puncture showing elevated WBC, elevated protein, decreased glucose, positive gram stain or culture, according to the Infectious Diseases Society of America 1, 3
Viral encephalitis involves brain parenchyma inflammation, resulting in confusion, personality changes, or focal signs, with workup including MRI brain with contrast, CSF analysis with viral PCR panel, and EEG to evaluate for subclinical seizures, as suggested by the American Academy of Neurology 3
Eosinophilic meningitis, such as Angiostrongylus cantonensis, presents with severe acute headache, meningism, visual disturbance, cranial nerve palsies with marked peripheral eosinophilia, and is treated with prednisolone and albendazole, according to the World Health Organization 1

Brucellosis is characterized by acute or insidious fever, night sweats, severe fatigue, headache, and arthralgia, with diagnosis based on blood culture for Brucella species or fourfold rise in agglutination titer, as recommended by the Centers for Disease Control and Prevention 2
The American College of Physicians suggests that patients with severe headache, fever, and chills should be evaluated for systemic infections, including brucellosis, and that occupational and dietary risk factors should be considered 2

The European Society of Clinical Microbiology and Infectious Diseases recommends that patients with suspected meningitis or encephalitis should undergo immediate assessment, including vital signs, neurological examination, and laboratory evaluation, including blood work and imaging 3
The American College of Radiology suggests that non-contrast CT head should be performed before lumbar puncture if there is concern for mass effect, abscess, or increased intracranial pressure 4

The Infectious Diseases Society of America recommends empiric therapy with IV ceftriaxone, vancomycin, and acyclovir for suspected meningitis or encephalitis, and that symptomatic headache management should include IV metoclopramide and ketorolac 5