Headache is one of the most common emergency room complaints. Learn how ER doctors distinguish migraine from brain bleed, meningitis, and other dangerous causes of head pain.

A sudden explosive headache can signal subarachnoid hemorrhage, a dangerous form of bleeding around the brain often caused by aneurysm rupture. Learn how it presents, how it is diagnosed, and why rapid evaluation matters.

A lumbar puncture, or spinal tap, helps diagnose meningitis, brain bleeding, and dangerous pressure inside the skull. Learn how the procedure works and why it is sometimes essential in emergency care.