The three major signs of meningeal irritation

Meningeal signs are an important neurological finding, commonly seen in conditions such as meningitis, subarachnoid hemorrhage, cerebral edema, and increased intracranial pressure. The three classic signs include nuchal rigidity, a positive Kernig's sign, and a positive Brudzinski's sign. Nuchal rigidity is characterized by stiffness and increased muscle tone in the neck when a patient lying flat is passively raised into a sitting position, resulting in resistance to forward flexion and limited lateral movement. A positive Kernig's sign occurs when, with the patient lying supine and legs extended, passive elevation of one leg meets resistance and triggers muscle spasms in the lower limb. A positive Brudzinski's sign is observed when passive flexion of the head in a supine patient causes involuntary flexion of both hips and knees.

If any of these signs are detected, prompt medical evaluation is necessary.