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Idiopathic Intracranial Hypertension

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Welcome to Your Guide on Idiopathic Intracranial Hypertension (IIH)

If you or a loved one has been diagnosed with Idiopathic Intracranial Hypertension (IIH), this guide is for you. Living with IIH can be challenging, but understanding the condition, its symptoms, and available treatments can help you manage it effectively. We’ll explain what IIH is, what causes it, how it’s diagnosed, and the various ways it can be treated, including newer neurointerventional options.

What is Idiopathic Intracranial Hypertension (IIH)?

Idiopathic Intracranial Hypertension (IIH) is a condition where there is high pressure inside your skull. This pressure is caused by a buildup of cerebrospinal fluid (CSF), the clear liquid that surrounds and cushions your brain and spinal cord. The term “idiopathic” means that the cause of this high pressure is not known.

You might hear IIH also called “pseudotumor cerebri”. This older name was used because the symptoms of IIH can be very similar to those caused by a brain tumor. However, it’s very important to know that you do not have a brain tumor if you have IIH. “Pseudo” means false, so “pseudotumor” means “false tumor”.

What Causes IIH?

As mentioned, the exact cause of IIH is unknown. However, experts have identified several factors that are strongly linked to the condition:

  • Weight: There is a clear link between IIH and being overweight or obese, or having experienced recent significant weight gain. Losing weight can be a very effective part of treatment.
  • Gender and Age: IIH is much more common in women, accounting for about 90% of cases. It primarily affects women between the ages of 20 and 50, but can occur in teenagers and young women, and people of any age.
  • Medications: Certain medications can increase the risk of developing IIH. These include some antibiotics (like tetracycline, minocycline, doxycycline), high doses of vitamin A, and retinoids. Growth hormone can also rarely lead to IIH.
  • Other Conditions: While rare, IIH has been linked to conditions such as hypoparathyroidism, Addison's disease, lupus, and even a lack of red blood cells (iron deficiency anemia).
  • Theories: Researchers are exploring possibilities such as blockages in the pathways that cerebrospinal fluid uses to travel through the brain, or a narrowing of the large veins in your brain (venous sinuses) which can cause fluid or blood to back up.

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What are the Symptoms of IIH?

The symptoms of IIH occur because of the increased pressure around your brain and optic nerves. Not everyone will experience all symptoms, but some common ones include:

  • Headaches: These are the most common symptom, often described as a constant throbbing headache. They may be worse in the morning or when lying down, and sometimes improve when standing up.
  • Vision Changes: This is a critical symptom to watch for. You might experience brief periods (a few seconds) of dimming, blurring, or "graying out" of vision, especially when bending down, stooping, or lying down and then rising up. Some people also notice blind spots in their side vision.
  • Pulsatile Tinnitus: This is a rhythmic, whooshing, heartbeat-like noise you hear in one or both ears.
  • Neck and Shoulder Pain: Discomfort or pain in these areas is also common.
  • Other Symptoms: Less common symptoms can include double vision, nausea and vomiting, fatigue, dizziness, problems with coordination and balance, irritability, and sensitivity to bright lights (photophobia).

It is crucial to tell your doctor immediately if you notice any changes in your vision, as this could indicate worsening optic nerve swelling, which could lead to permanent vision loss if left untreated.

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Possible Complications of IIH

While IIH is generally not life-threatening, it can significantly impact your quality of life. The most serious complication is permanent vision loss. The increased pressure around your brain can cause swelling of the optic nerve (papilledema), which can lead to severe peripheral (side) vision loss, blurred central vision, and, in rare severe cases, blindness. Timely treatment is key to preventing this irreversible complication.

How is IIH Diagnosed?

Diagnosing IIH involves several steps to confirm the high pressure and rule out other possible causes:

  • Eye Examination: A thorough eye exam is performed, including special tests on your vision and looking at the back of your eye (often with pupil dilation) to check for swelling of the optic nerves, called papilledema.
  • Brain Scans: Imaging tests like an MRI (Magnetic Resonance Imaging), usually including vein imaging (MRV), are done to make sure there is no tumor, blood clot, or other identifiable cause for the suspected high pressure. Sometimes, these scans might show clues like flattening of the pituitary gland or extra fluid around the optic nerves, which suggest IIH.
  • Spinal Tap (Lumbar Puncture): This is a key test to confirm high pressure and ensure the fluid surrounding your brain and spinal cord (CSF) is otherwise normal.
  • During this procedure, a thin needle is carefully inserted into your lower back, into the fluid-filled space around your spinal cord.
  • The doctor measures the "opening pressure" of the CSF while you are relaxed and lying on your side.
  • A small amount of CSF is collected for further testing to rule out infection or other conditions.
  • It's generally safe, but you might experience some discomfort or a headache afterward. To reduce the risk of headache, you'll be asked to lie flat for at least an hour after the procedure, stay well hydrated, and avoid strenuous activities for a day or two.

You’ll likely be seen by several specialists, including a neuro-ophthalmologist (experts in IIH who guide treatment), an ophthalmologist (to monitor your vision), a neurologist (to help with headaches), a neurointerventionist or a neurosurgeon (if surgery is needed).

Treatment Options for IIH

The main goals of IIH treatment are to decrease the pressure in your brain and prevent vision loss. Most people are treated with a combination of medications and weight loss. Surgery is usually considered only if these approaches don’t work or if vision loss is progressing.

1. Weight Management

For individuals who are overweight or obese, weight loss is often the first and most effective treatment. Losing even a modest amount of weight, such as 6-10% of your starting body weight, can significantly reduce brain pressure, improve optic nerve swelling, vision, and headaches. In some cases, it can even lead to the disease going into remission.

Sustainable lifestyle changes are more effective than crash diets. Here are some tips for a healthy lifestyle:

Eating Habits:

  • Don't skip breakfast and aim for three healthy, balanced meals a day.
  • Eat slowly; it takes about 20 minutes for your stomach to signal to your brain that you're full.
  • Choose healthy snacks like fruits, vegetables, or small portions of unsalted nuts.
  • Drink plenty of water, as the body can confuse hunger with thirst.
  • Practice portion control and ensure meals include a balance of protein, carbohydrates, fats, and vegetables.
  • Focus on lean proteins, lots of vegetables, healthy fats (like avocados), and slow-release carbohydrates (like whole grains, potatoes, beans).
  • Avoid simple carbohydrates like white bread, sugary drinks, cakes, biscuits, and processed foods that cause rapid blood sugar spikes.

Exercise:

  • Aim for at least 30 minutes of moderate exercise five days a week.
  • Low-impact aerobic exercises such as walking, cycling, swimming, and yoga are typically recommended.
  • Avoid high-impact activities like running and jumping, or exercises that strain your neck or head (e.g., heavy weightlifting, certain yoga poses), as these can increase pressure.
  • Sleep: Aim for at least 7 hours of sleep per night, as lack of sleep can affect hormones that influence weight.
  • Support: Losing weight can be hard. Seek support from family, friends, dietitians, or structured weight management programs. In some cases, bariatric (weight loss) surgery or injectable medications for weight loss might be helpful.

Remember, while weight loss is extremely beneficial for managing symptoms and improving quality of life, exercise and weight loss alone cannot cure IIH. It’s part of a comprehensive treatment plan. Also, IIH can return if weight is regained.

2. Medications

Your doctor may prescribe medications to help manage your IIH symptoms:

  • Acetazolamide (Diamox): This is the most commonly used medication. It works by reducing the production of cerebrospinal fluid in your brain, thereby lowering the pressure inside your skull. It has been shown to improve vision, optic nerve swelling, quality of life, and CSF pressure.
  • Common side effects include tingling in fingers and toes, a metallic taste when drinking fizzy drinks, decreased appetite, and tiredness. Some people also experience nausea, fatigue, headache, vomiting, diarrhea, dizziness, and increased urination.
  • Your doctor will discuss the starting dose and how to gradually increase it to manage side effects, as some people can only tolerate lower doses. Taking it with meals or eating potassium-rich foods may help reduce side effects.
  • It's important to tell your doctor about any kidney problems, low potassium or sodium levels, allergies to sulfa drugs, diabetes, or other medications you are taking, as acetazolamide can interact with some drugs like high-dose aspirin or lithium.
  • If you are pregnant or planning to be, discuss this with your doctor, as acetazolamide is generally not recommended during pregnancy, especially in the first trimester, although it may be considered after the first trimester in some cases. It is generally considered safe for breastfeeding.
  • Topiramate (Topamax): This medication can be an alternative if you cannot tolerate acetazolamide. It may also help lower pressure, manage headaches (especially migraines, which often occur with IIH), and assist with weight loss. A possible side effect is a mild slowing of thought processes.
  • Other Medications: Sometimes, furosemide or methazolamide, which are diuretics (water pills), are used as alternatives to help decrease fluid retention and reduce CSF production.
  • Pain Relievers: Over-the-counter pain medications like NSAIDs or migraine-specific drugs may help with headaches, but using them too frequently (more than 2-3 days a week for several months) can lead to "medication-overuse headache," which can make headaches worse.

3. Surgical Treatments

Surgery is considered when vision is getting worse despite aggressive medical treatment and weight loss. Since surgery carries risks, it’s usually not recommended if your vision is good. The goal of surgery is to relieve pressure around the optic nerves. There are several types:

  • Shunt Surgery: A neurosurgeon places a flexible tube (shunt) into a fluid-filled space in your brain or spinal canal to divert excess CSF to another part of your body, usually your abdomen, where it can be absorbed.
  • Optic Nerve Sheath Fenestration (ONSF): An eye surgeon creates a small opening in the protective lining (sheath) around your optic nerve. This allows fluid to drain from behind your eye, reducing pressure on the optic nerve and improving swelling.
  • Venous Sinus Stenting: This is a newer endovascular treatment that focuses on addressing narrowed veins within the skull.
  • How it works: If a major vein inside your skull (a venous sinus) that drains blood from your brain is narrowed, it can restrict blood flow and contribute to high pressure. A specially-trained surgeon inserts a small device called a stent into this narrowed vein to hold it open. Opening the vein more fully with a stent can help lower the pressure inside the skull.
  • Who might benefit: This procedure may be considered for patients whose condition doesn't respond well to medications and weight loss, especially those with identified vein narrowing. It's often associated with people who hear their own pulse (pulsatile tinnitus).
  • Preparation: Before considering a stent, doctors might measure the pressure within your veins during a procedure called a cerebral angiogram. This involves inserting a thin catheter, usually through a small incision in the groin, and advancing it to measure pressures in different areas of the brain and neck.
  • Post-Surgery: You will typically need to take blood thinners for at least 6 months after the procedure.
  • Important Considerations: This technique is still being studied, and specialists are determining the best situations for its use. It is generally not a good option for pregnant patients because of the need for blood thinners and X-Ray radiation during the procedure. It is important to know that there are no FDA approved stents yet for intracranial placement but surgeons can use peripheral stents off-label.

All surgical procedures carry potential risks, so it’s essential to have a thorough discussion with your surgeon about what your operation involves and its possible complications.

Living with IIH

IIH can be an unpredictable illness, with good days and bad days. It’s important to be patient with yourself, as your abilities can change quickly. Focus on the present, but also maintain hope for future advancements in treatments.

Support from friends and family is invaluable. Sometimes, the best thing they can do is simply listen without judgment. Encourage loved ones to educate themselves about IIH, as its effects are not always visible. If you’re a caregiver, you may need to act as an advocate for your friend or relative, especially when they are too sick to speak for themselves.

IIH may be a lifelong condition for some, while others might see it resolve over months to years. It can return, particularly if weight is regained. Regular follow-ups with your healthcare provider and eye doctor are crucial to monitor your health and vision. Always report any vision changes immediately.

Summary

Idiopathic Intracranial Hypertension (IIH) is a condition of unexplained high pressure inside the skull, often affecting overweight women. It is not a brain tumor but can cause similar symptoms, most notably headaches, vision problems, and pulsatile tinnitus. If left untreated, IIH can lead to permanent vision loss. Diagnosis involves eye exams, brain scans, and a spinal tap. Treatment typically begins with weight management and medications like acetazolamide. For severe cases or when other treatments fail, surgical options such as shunts, optic nerve sheath fenestration, or the newer endovascular venous stenting procedure may be considered to relieve pressure. Living with IIH requires patience, proactive symptom monitoring, and working closely with your healthcare team to develop a personalized treatment plan focused on managing symptoms and protecting your vision.