What is idiopathic intracranial hypertension?

Idiopathic intracranial hypertension (IIH) is a condition caused by increased pressure around the brain. This happens even though there is no brain tumor or other serious structural problem causing the pressure.

The condition develops when cerebrospinal fluid, which cushions the brain and spinal cord, builds up or is not absorbed properly. Over time, the extra pressure can affect vision and cause ongoing headaches.

The exact cause of IIH is not always known. However, several factors can increase the risk, including obesity, certain medications, and hormonal changes. The condition is most common in women between ages 20 and 45.

Symptoms

IIH symptoms can develop gradually or appear suddenly. Many symptoms are related to pressure changes around the brain and eyes.

Common symptoms include:

• Frequent or severe headaches
• Blurred or double vision
• Brief episodes of vision loss or reduced side vision
• Ringing or pulsing sounds in the ears
• Nausea or vomiting
• Dizziness
• Neck or shoulder discomfort
• Trouble concentrating or remembering things

How is it diagnosed?

Healthcare providers diagnose IIH by ruling out other conditions that can raise pressure inside the skull. Your provider will review your symptoms, medical history, and vision changes.

Testing may include:

• A neurological exam
• An eye exam to check for swelling of the optic nerve
• MRI or CT imaging of the brain
• A lumbar puncture (spinal tap) to measure spinal fluid pressure

Early diagnosis is important to help protect vision and prevent complications.

How is it treated?

Treatment for IIH focuses on lowering pressure around the brain and protecting eyesight. Many people improve with a combination of lifestyle changes and medication.

Treatment options may include:

• Weight loss and healthy lifestyle changes
• Reducing salt intake
• Medications that decrease spinal fluid production
• Regular eye monitoring
• Lumbar punctures to relieve pressure in some cases

If symptoms become severe or vision is at risk, surgery may be recommended. Procedures can help drain excess fluid or reduce pressure on the optic nerve.

Recovery varies from person to person. Some people improve quickly, while others need long-term monitoring because symptoms can return over time.