Sources & References
Nimbus shows you the information you log yourself. Where a screen compares your own data against a published clinical criterion, that criterion comes from one of the sources below.
Clinical criteria
International Classification of Headache Disorders, 3rd edition (ICHD-3), International Headache Society (2018)
Defines non-opioid analgesic-overuse headache as headache on 15 or more days per month in someone with a pre-existing primary headache, developing from regular use of one or more non-opioid analgesics on 15 or more days per month for more than 3 months. All non-opioid analgesics are treated as a single class.
https://ichd-3.org/8-headache-attributed-to-a-substance-or-its-withdrawal/8-2-medication-overuse-headache-moh/8-2-3-simple-analgesic-overuse-headache/
International Classification of Headache Disorders, 3rd edition (ICHD-3), International Headache Society (2018)
Defines triptan-overuse headache as regular intake of one or more triptans, in any formulation, on 10 or more days per month for more than 3 months, in a person who also meets the criteria for medication-overuse headache.
https://ichd-3.org/8-headache-attributed-to-a-substance-or-its-withdrawal/8-2-medication-overuse-headache-moh/8-2-2-triptan-overuse-headache/
International Classification of Headache Disorders, 3rd edition (ICHD-3), International Headache Society (2018)
The parent classification for medication-overuse headache. Lists overuse subtypes by drug class — ergotamine, triptan, non-opioid analgesic, opioid and combination-analgesic. There is no subtype for gepants (ubrogepant, rimegepant).
https://ichd-3.org/8-headache-attributed-to-a-substance-or-its-withdrawal/8-2-medication-overuse-headache-moh/
Kimoto K, Aiba S, Takashima R, et al. Internal Medicine 50(18):1923–1928 (2011)
A one-year headache-diary study of 28 people with migraine. Migraine frequency increased when barometric pressure was more than 5 hPa lower on the day after the headache than on the headache day, and decreased when pressure two days after was more than 5 hPa higher. Weather change was associated with migraine in 18 of the 28 participants (64%).
https://doi.org/10.2169/internalmedicine.50.5640
Katsuki M, et al. Headache: The Journal of Head and Face Pain (2023)
A retrospective study of headache diary entries recorded through a smartphone app. A decrease in barometric pressure in the hours before onset was among the strongest predictors of a headache occurring. The study reports how much each weather variable contributed to the model; it does not define a threshold in hPa.
https://doi.org/10.1111/head.14482
Ailani J, Burch RC, Robbins MS. Headache: The Journal of Head and Face Pain (2021)
The American Headache Society’s guidance on how newer acute and preventive migraine treatments, including the gepants, fit into clinical practice. States that with oral treatments, prevention plans should be followed for a minimum of 8 weeks at a target therapeutic dose before lack of effectiveness can be determined.
https://doi.org/10.1111/head.14153
Where the measurements come from
Barometric pressure is measured for you rather than entered by you. These are the services that provide it.
Barometric pressure readings, taken from the nearest reporting airport weather station to your location. Published as public domain data.
Turns a city or ZIP code you type into map coordinates, so the nearest weather station can be found. It is not the source of any pressure reading.
Nimbus is a tracking tool, not a medical device, and does not diagnose any condition or recommend any treatment. The criteria above are published definitions used for context only — they are not an assessment of you. Always consult a qualified healthcare provider about your migraines and medications.