IIH Risk Factors in Women: Weight Change, Hormones and Medications

Your risk of developing IIH is associated with factors such as body weight and recent weight gain, while hormonal influences remain under study. Certain medicines can instead cause secondary intracranial hypertension and are therefore important to review.

Your doctor will consider your overall health, symptoms and medicine history rather than linking IIH to one factor alone.

What Does an IIH Risk Factor Actually Mean?

Your IIH risk factors can increase your likelihood of developing the condition, but they do not mean that you will definitely develop it. Your weight and recent weight gain are strongly associated with IIH, but you can develop IIH without fitting the typical profile.

Your doctor uses these factors to understand your overall risk. Your symptoms and eye findings are considered alongside brain imaging and, when appropriate, lumbar puncture findings to establish the diagnosis and exclude other causes of raised intracranial pressure.

Why Does IIH Affect Women More Often?

IIH is more commonly seen in women of reproductive age, but being female does not by itself cause the condition. Your hormones, metabolism and body-fat distribution may all play a role, although the exact reasons are still being studied.

IIH can also occur in men, children and people after menopause. Your age, sex and weight help your doctor assess risk, but they do not diagnose IIH.

How Important Is Body Weight as an IIH Risk Factor?

Higher body weight is one of the strongest recognised risk factors for IIH, particularly if you are a woman of reproductive age. Your risk generally increases with higher BMI.

Your weight does not mean you caused your IIH, and most people with obesity do not develop the condition. Your doctor will therefore consider your weight alongside your symptoms, eye findings and other clinical factors.

Clinical Tip

Keep a record of your medicines, supplements and recent weight changes if you are being assessed for IIH. Include when you started or stopped a medicine, dose changes and when symptoms first appeared.

This information can help your doctor distinguish secondary causes of raised intracranial pressure from IIH risk factors. Do not stop a prescribed medicine yourself, as some medicines need gradual reduction.

Why Does Recent Weight Gain Matter?

Your recent weight gain may be relevant when your doctor is assessing your risk of developing IIH. Looking at changes in your weight over time can provide useful context alongside your current weight and other factors.

• Recent weight gain may be relevant: Changes in your weight may be considered when assessing your risk of IIH, even if your current BMI is not within the obesity range.
• Weight history can provide context: Your doctor may consider how your weight has changed over time rather than looking only at your current weight.
• Weight gain does not guarantee IIH: Having gained weight does not mean that you will develop IIH, as the condition has multiple contributing factors.
• Changes may matter if symptoms return: If your IIH symptoms return after a period of improvement, your doctor may review recent weight changes as part of your overall assessment.

Recent weight gain is therefore one factor your doctor may consider rather than a definite cause of IIH. Your weight history, symptoms and other clinical information can help your doctor understand your individual situation.

Can You Develop IIH If You Are Not Overweight?

IIH can develop even if you are not overweight. Your doctor may look more carefully for other causes of raised intracranial pressure by reviewing your medicines, medical history and scan results.

Your risk factors support the assessment, but eye examination, visual-field testing, brain imaging and other investigations are still needed to establish the diagnosis and exclude secondary causes.

Could Metabolism Help Explain the Link with Weight?

IIH may involve more than your body weight alone. Your metabolism, hormones and changes in fat tissue may also influence how the condition develops.

Researchers are still studying these links, so the exact mechanism is not fully understood. Your weight-related risk may therefore be more complex than a simple effect of body weight on intracranial pressure.

IIH Risk Factors in Women: Comparison of Key Factors

Potential risk factor	What the evidence suggests	What it means for you
Higher body weight or obesity	One of the strongest recognised associations with IIH.	Your weight may increase your risk, but having obesity does not mean you will develop IIH.
Recent weight gain	Strongly associated with developing or recurrent IIH.	Your weight history can be relevant even if your current BMI is not in the obesity range.
Female sex and reproductive age	IIH is much more common in women of reproductive age.	Being a woman does not diagnose IIH or mean that you will develop it.
Hormonal factors	Hormonal and metabolic changes are being studied, including androgens.	Hormones may contribute, but no single hormone has been proven to cause IIH.
PCOS and metabolic factors	PCOS and IIH can occur together, with obesity and metabolic factors potentially contributing to the association.	Having PCOS does not mean that you have or will develop IIH.
Hormonal contraception	Current evidence does not show a significant association between hormonal contraception and IIH prevalence.	Do not stop contraception because of IIH concerns without discussing it with your doctor.
Certain medicines	Some medicines are associated with secondary intracranial hypertension, including tetracyclines, vitamin A derivatives, growth hormone and lithium.	Your medication history can help your doctor identify whether raised pressure may have a secondary cause.
Pregnancy	Available evidence does not show that pregnancy consistently causes IIH recurrence, although symptoms may worsen in some people.	Pregnancy planning and monitoring may be important if you have IIH, particularly when vision is affected.

What Do Researchers Know About Hormones and IIH?

Your hormones may play a role in IIH, particularly because the condition is more common in women of reproductive age. However, no single hormone has been proven to cause IIH.

Your hormonal and reproductive history may still be relevant to your assessment, but your weight and recent weight gain are stronger recognised associations.

Do Oestrogen and Progesterone Cause IIH?

Oestrogen and progesterone have been studied because IIH is more common during the reproductive years. However, normal exposure to these hormones has not been proven to directly cause IIH.

Your reproductive biology may contribute to your susceptibility, but your hormones are only one part of a more complex picture involving your metabolism and other factors.

Could Androgens Such as Testosterone Be Involved?

Androgens, including testosterone, are being studied as one possible factor in IIH. Research has found differences in androgen patterns in some people with IIH, but these findings do not diagnose the condition.

Your testosterone level is not used on its own to diagnose IIH. Hormonal changes are still being investigated as one possible part of a more complex process.

Research Insight

Research into IIH increasingly focuses on metabolic and hormonal mechanisms rather than body weight alone. Studies have identified metabolic changes and an androgen-related pattern in some people with IIH, suggesting adipose tissue, insulin resistance and hormone signalling may contribute to intracranial pressure regulation. However, these findings describe possible mechanisms and do not mean a particular hormone level can diagnose IIH.

Recent research also suggests that weight and IIH are more complex than BMI alone. Recent weight gain has been associated with development and recurrence of IIH, including in some people who are not living with obesity. Researchers are continuing to investigate how metabolic and hormonal changes interact with weight, cerebrospinal fluid regulation and intracranial pressure.

Is Polycystic Ovary Syndrome Linked with IIH?

PCOS appears to be more common among women with IIH than in the general population, although this does not mean that PCOS directly causes IIH. Your two conditions may share factors such as weight gain, insulin resistance and androgen changes.

Your IIH still needs assessment based on your intracranial pressure and vision, while your PCOS should be managed separately according to your symptoms and health needs.

Do Menstrual Changes Prove That Hormones Are Causing Your IIH?

Your menstrual changes do not prove that hormones are causing your IIH. Your irregular periods can have several causes, including PCOS and weight changes.

Your doctor will assess your IIH using your papilloedema, visual fields and other findings rather than menstrual symptoms alone.

Does Hormonal Contraception Increase Your Risk of IIH?

Current evidence does not show a significant association between hormonal contraception use and IIH prevalence. A 2026 systematic review and meta-analysis found no significant association, including oral contraceptives and hormonal IUDs.

Your individual circumstances still matter. Your doctor can review your contraception alongside your symptoms and other risk factors. Do not stop or change it without medical advice.

Evidence Note

A 2026 systematic review and meta-analysis examined hormonal contraception and IIH. Across 13 studies involving more than 5,000 people with IIH and more than 669,000 controls, researchers found no significant association with IIH prevalence.

However, the certainty of the evidence was low to very low, and the studies varied considerably. Current evidence is reassuring but does not completely exclude an association. Your doctor can consider your contraception alongside your symptoms, medical history and other risk factors.

Does Pregnancy Increase the Risk of IIH?

Pregnancy is not considered a usual direct cause of IIH. In established IIH, confirmed relapse during pregnancy appears uncommon, although headaches, tinnitus or visual symptoms may worsen. Your IIH may need closer monitoring because weight, medicines and vision may need careful management.

Your doctors may review treatment before pregnancy and monitor your vision during it. If you are planning a pregnancy, discuss your IIH care with your medical team beforehand.

Can Medicines Cause Raised Intracranial Pressure?

Your medicines can sometimes contribute to raised intracranial pressure. Your doctor may consider certain medicines, including vitamin A derivatives, tetracycline antibiotics, growth hormone and lithium, when investigating your symptoms.

Your medicine history is important when assessing whether your pressure is drug-related or truly idiopathic. Do not stop any prescribed medicine without discussing it with your doctor.

UK Guidance Note

UK consensus guidance recommends considering secondary causes of raised intracranial pressure, including medicines and medical conditions, even in people with a typical IIH profile.

UK guidance recognises tetracycline-class antibiotics, vitamin A derivatives, lithium, growth hormone and corticosteroid withdrawal as possible causes. Your doctor will consider your medication history alongside symptoms, eye examination and investigations rather than assuming risk factors confirm IIH.

Why Are Tetracycline Antibiotics Important?

Tetracycline antibiotics, such as doxycycline or minocycline, can be associated with raised intracranial pressure. Most people taking them do not develop this problem, but your medicine history can be important when you have persistent headaches, pulsatile tinnitus or visual changes.

Your doctor may review when you started the medicine and when your symptoms appeared. Your eyes still need proper assessment, so do not stop your medicine without medical advice.

What About Vitamin A and Retinoid Medicines?

High-dose vitamin A and some retinoid medicines, such as isotretinoin, can be associated with raised intracranial pressure. Normal dietary vitamin A is not usually the concern.

Tell your doctor about supplements and medicines when being assessed for IIH. Do not stop a prescribed retinoid without speaking to your clinician.

Are Growth Hormone, Lithium and Steroids Relevant?

Growth hormone and lithium can be associated with drug-induced intracranial hypertension. Corticosteroid withdrawal, particularly after prolonged treatment, has been associated with raised intracranial pressure.

Your medication timeline can help your doctor assess whether a medicine may be involved. Do not suddenly stop your corticosteroids, as withdrawal can be dangerous.

Myth vs Fact

Myth	Fact
Only women with obesity can develop IIH.	IIH can also occur in people who are not overweight, men, children and after menopause.
If you have obesity, you will develop IIH.	Obesity is strongly associated with IIH, but most people with obesity do not develop it.
Recent weight gain does not matter if your BMI is normal.	Recent weight gain can matter even when your current BMI is not in the obesity range.
Being a woman automatically means you have IIH.	IIH is more common in women of reproductive age, but sex alone does not diagnose it.
Hormones are proven to be the direct cause of IIH.	Hormonal and metabolic factors are being researched, but no single hormone is proven to directly cause IIH.
PCOS causes IIH.	PCOS and IIH can occur together, but PCOS is not proven to directly cause raised intracranial pressure.
Hormonal contraception causes IIH.	Current evidence does not show a significant association between hormonal contraception and IIH prevalence, although the evidence has limitations.
Pregnancy always makes IIH come back.	Available studies suggest recurrence during pregnancy is uncommon, although some people may experience worsening symptoms and need closer monitoring.
Only medicines taken for a long time can cause raised intracranial pressure.	Some medicines can be associated with raised intracranial pressure, and medication timing can be relevant.
If you have an IIH risk factor, you do not need medical tests.	Risk factors do not diagnose IIH. Eye examination, visual assessment, brain imaging and, when appropriate, lumbar puncture are used to establish the diagnosis and exclude other causes.

Key Takeaways

• IIH is most common in women of reproductive age, especially with higher body weight and recent weight gain.
• Recent weight gain can be relevant even if your current BMI is not in the obesity range.
• Being overweight or female does not mean that you will develop IIH.
• IIH can also occur in men, children and after menopause.
• Hormonal and metabolic factors may contribute to IIH, but no single hormone is proven to directly cause it.
• PCOS can occur alongside IIH but is not proven to directly cause raised intracranial pressure.
• Current evidence does not show a significant association between hormonal contraception and IIH prevalence.
• Pregnancy may require closer monitoring if you have IIH, particularly when vision is affected.
• Certain medicines, including tetracyclines, vitamin A derivatives, growth hormone and lithium, can cause secondary intracranial hypertension.
• Corticosteroid withdrawal may also be relevant when assessing raised intracranial pressure.
• Risk factors support clinical assessment but do not diagnose IIH.
• New or worsening visual symptoms need prompt assessment because raised pressure can threaten vision.

Frequently Asked Questions

1. What are the main risk factors for IIH in women?
   Your body weight and recent weight gain are among the strongest recognised associations with IIH. Your age, sex, hormonal factors, medical history and certain medicines may also be relevant.
2. Can you develop IIH if you are not overweight?
   Yes. IIH can develop even if you are not overweight. Your doctor may look more carefully for other possible causes of raised intracranial pressure by reviewing your medicines, medical history and scan results.
3. Why does IIH affect women more often?
   IIH is more commonly seen in women of reproductive age, although being female does not itself cause the condition. Hormones, metabolism and body-fat distribution may contribute, but the exact reasons are still being studied.
4. Does recent weight gain increase your risk of IIH?
   Your recent weight gain may be relevant to your risk of developing IIH, even if your current BMI is not in the obesity range. Your doctor may consider your weight history alongside your symptoms and other clinical findings.
5. Do hormones cause IIH?
   No single hormone has been proven to directly cause IIH. Oestrogen, progesterone, androgens and other hormonal factors are being studied because IIH is more common in women of reproductive age.
6. Is polycystic ovary syndrome (PCOS) linked with IIH?
   PCOS may be more common in people with IIH, but it has not been proven to directly cause raised intracranial pressure. The two conditions may share factors such as weight gain, insulin resistance and androgen changes.
7. Does hormonal contraception increase your risk of IIH?
   Current evidence does not show a significant association between hormonal contraception use and IIH prevalence. Your doctor can still review your contraception alongside your symptoms and other risk factors, and you should not stop or change it without medical advice.
8. Can pregnancy affect your risk of IIH?
   Pregnancy is not considered a usual direct cause of IIH, and confirmed relapse appears to be uncommon in people with established IIH. However, symptoms can worsen during pregnancy, so your doctors may monitor your vision and review your treatment carefully.
9. Which medicines can cause raised intracranial pressure?
   Certain medicines can contribute to raised intracranial pressure, including vitamin A derivatives, tetracycline antibiotics such as doxycycline or minocycline, growth hormone and lithium. Corticosteroid withdrawal can also be relevant, particularly after prolonged treatment.
10. Should you stop a medicine if you think it may be linked to IIH?
    No. You should not stop any prescribed medicine without discussing it with your doctor. Your specialist can review your medication history and determine whether a medicine may be contributing to your symptoms.

Final Thoughts: IIH Risk Factors in Women

IIH is more common in women of reproductive age, with body weight and recent weight gain among the strongest recognised associations. Hormonal influences and certain medicines may also be relevant, but these factors do not confirm IIH. Your symptoms, eye findings and appropriate investigations are important when assessing raised intracranial pressure.

If you have headaches, pulsatile tinnitus or visual symptoms that could be related to raised intracranial pressure, contact Eye Clinic London for assessment and advice on appropriate next steps.

References:

1. Mollan, S.P., Davies, B., Silver, N.C., Shaw, S., Mallucci, C.L., Wakerley, B.R., Krishnan, A., Chavda, S.V., Ramalingam, S., Edwards, J., Hemmings, K., Williamson, M., Burdon, M.A., Hassan-Smith, G., Digre, K., Liu, G.T., Højland Jensen, R. and Sinclair, A.J. (2018) ‘Idiopathic intracranial hypertension: consensus guidelines on management’, Journal of Neurology, Neurosurgery & Psychiatry, 89(10), pp. 1088–1100. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC6166610/
2. O’Reilly, M.W., Westgate, C.S.J., Hornby, C., Botfield, H., Taylor, A.E., Markey, K., Mitchell, J.L., Scotton, W.J., Mollan, S.P., Yiangou, A., Jenkinson, C., Gilligan, L.C., Sherlock, M., Gibney, J., Tomlinson, J.W., Lavery, G.G., Hodson, D.J., Arlt, W. and Sinclair, A.J. (2019) ‘A unique androgen excess signature in idiopathic intracranial hypertension is linked to cerebrospinal fluid dynamics’, JCI Insight, 4(6), Article e125348. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC6483000/
3. Mihalache, A., Huang, R.S., Tyndel, F.J., Ing, E., Mollan, S.P. and Sundaram, A.N.E. (2026) ‘Idiopathic intracranial hypertension prevalence and hormonal contraception: a meta-analysis’, Neurology, 106(8), Article e214832. Available at: https://pubmed.ncbi.nlm.nih.gov/41881051/
4. Potter, O., Menon, V. and Mollan, S.P. (2024) ‘Risk factors and disease associations in people living with idiopathic intracranial hypertension’, Expert Review of Neurotherapeutics, 24(7), pp. 681–689. Available at: https://pubmed.ncbi.nlm.nih.gov/38803205/
5. Rzewuska, N., Kunicki, J., Pieniak, K., Laskus, P., Zabielska, B., Smolarczyk, R. and Kunicki, M. (2024) ‘A systematic review on idiopathic intracranial hypertension comorbid with polycystic ovarian syndrome and its consequences’, European Journal of Obstetrics & Gynecology and Reproductive Biology, 292, pp. 1–7. Available at: https://www.sciencedirect.com/science/article/pii/S0301211523008059