Reported incidence rates of IIH worldwide
| Region | Year(s) of study | Incidence per 100 000 | Incidence in females | Incidence in females of childbearing age | Incidence in females with obesity |
| US (Iowa)18 | 1984–1985 | 0.9 | 3.5 | 13 | |
| US (Louisiana)18 | 1984–1985 | 1.07 | 14.9 | ||
| Libya (Benghazi)19 | 1982–1989 | 2.2 | 4.3 | 12 | 21.4 |
| US (Minnesota)20 | 1976–1990 | 0.98 | 1.6 | 3.3 | 7.9 |
| Japan36 | 1993 | 0.03 | |||
| Northern Ireland21 | 1991–1995 | 0.5 | 0.9 | ||
| Italy22 | 1990–1999 | 0.28 | 0.65 | 2.7 | |
| Israel23 | 1998–1999 | 0.57–0.94 | 1.82 | 4.02 | |
| Spain (Valladolid)24 | 1994–2004 | 3.2 | |||
| Israel25 | 2005–2007 | 2.02 | 3.17 | 5.49 | |
| UK (Sheffield)26 | 2007–2008 | 1.56 | 2.86 | 11.9 | |
| Spain (Santa Cruz de Tenerife)27 | 1999–2009 | 1.2 | |||
| Oman (South Sharqiyah)28 | 2001–2011 | 2.18 | 3.25 | 4.14 | |
| Sweden (Stockholm)29 | 2006–2013 | 0.65 | 1.1 | 1.96 | |
| US (Minnesota)30 | 1990–2014 | 1.8 | 3.3 | 6.8 | 22 |
| Northern Ireland31 | 2007–2014 | 2.36 | 4.65 | 9.85 | |
| Scotland (Fife)37 | 2013–2014 | 3.56 | |||
| USA33 | 1997–2016 | 1.15 | 1.97 | ||
| UK34 | 2002–2016 | 2.3 (2002) 4.7 (2016) | |||
| Scotland32 | 2016–2017 | 2.65 | 37.9 | ||
| Kuwait35 | 2018 | 3.28 | |||
| Australia (Southern Tasmania) (present study) | 2016–2018 | 5.4 | 5.4 |
IIH, idiopathic intracranial hypertension.