Conditions InDepth: Headache
- Side effects of medicines
- Overusing medicines to treat headaches
- Head injury
- Increased pressure in the head
- Episodic cluster headaches—(80% of all cases) occur one or more times daily for several months. The headaches then enter a period of remission and come back months or years later.
- Chronic cluster headaches—(20% of all cases) occur almost daily with, at most, one headache-free month during a year.
Headache—frequently asked questions. National Headache Foundation website. Available at: http://www.headaches.org/education/Tools%5Ffor%5FSufferers/Headache%5F-%5FFrequently%5FAsked%5FQuestions. Accessed November 7, 2012.
NINDS headache information page. National Institute of Neurological Disorders and Stroke website. Available at: http://www.ninds.nih.gov/disorders/headache/headache.htm. Updated September 2012. Accessed November 7, 2012.
International classification of headache disorders. 2nd ed. Cephalalgia. 2004:24(suppl):1-160.
International classification of headache disorders. 2nd ed. (1st revision.) Cephalalgia. 2005;25:460-465.
- Reviewer: Rimas Lukas, MD
- Review Date: 12/2013 -
- Update Date: 01/13/2014 -
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.
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