Sometimes your headache is a sign of a serious medical emergency called increased intracranial pressure (ICP). ICP is what happens when there is excess fluid or swelling inside your skull.

Intracranial hypertension (IH) is a condition in which pressure builds in the fluid around the brain. Here’s what you should know about IH, the symptoms, and what treatments may help.

low-pressure headaches (your doctor may call them spontaneous intracranial hypotension) and high-pressure headaches (idiopathic intracranial hypertension). These headaches are caused by changes in ...