Editing Cluster headache (section)

===Differential===
Cluster headache may be misdiagnosed as [[migraine]] or [[sinusitis]].<ref name=Tfelt-Hansen2012>{{cite journal |doi=10.2165/11632850-000000000-00000 |pmid=22650381 |title=Management of Cluster Headache |journal=CNS Drugs |volume=26 |issue=7 |pages=571–80 |year=2012 |last1=Tfelt-Hansen |first1=Peer C. |last2=Jensen |first2=Rigmor H. |s2cid=22522914 }}</ref> Other types of headache are sometimes mistaken for, or may mimic closely, cluster headaches. Incorrect terms like "cluster migraine" confuse headache types, confound differential diagnosis and are often the cause of unnecessary diagnostic delay,<ref>{{cite journal |doi=10.1046/j.1526-4610.2000.00127.x |pmid=11091291 |title=The Misdiagnosis of Cluster Headache: A Nonclinic, Population-Based, Internet Survey |journal=Headache |volume=40 |issue=9 |pages=730–5 |year=2000 |last1=Klapper |first1=Jack A. |last2=Klapper |first2=Amy |last3=Voss |first3=Tracy |s2cid=40116437 }}</ref> ultimately delaying appropriate specialist treatment.

Other types of headaches that may be confused with cluster headache include:
* [[Chronic paroxysmal hemicrania]] is a unilateral headache condition, without the male predominance usually seen in cluster headaches. Paroxysmal hemicrania may also be episodic but the episodes of pain seen in chronic paroxysmal hemicrania are usually shorter than those seen with cluster headaches. Chronic paroxysmal hemicrania typically responds "absolutely" to treatment with the [[anti-inflammatory]] drug [[indomethacin]]<ref name=IHS/> where in most cases cluster headaches typically show no indomethacin response, making "indomethacin response" an important diagnostic tool for specialist practitioners seeking correct differential diagnosis between the conditions.<ref>{{cite journal |doi=10.1177/0333102409357642 |pmid=20656709 |title=Cluster headache responsive to indomethacin: Case reports and a critical review of the literature |journal=Cephalalgia |volume=30 |issue=8 |pages=975–82 |year=2010 |last1=Prakash |first1=Sanjay |last2=Shah |first2=Nilima D |last3=Chavda |first3=Bhavna V |s2cid=5938778 }}</ref><ref>{{cite journal |pmid=20626997 |year=2010 |last1=Sjaastad |first1=O |title=Indomethacin responsive headache syndromes: Chronic paroxysmal hemicrania and Hemicrania continua. How they were discovered and what we have learned since |journal=Functional Neurology |volume=25 |issue=1 |pages=49–55 |last2=Vincent |first2=M }}</ref>
* [[Hemicrania continua]]<ref name="newdifferital">{{cite journal |author=Sanjay Prakash |author2=Nilima D Shah |author3=Bhavna V Chavda | s2cid =5938778 | title =Cluster headache responsive to indomethacin: Case reports and a critical review of the literature | journal =Cephalalgia | date = 2010 | volume =30 | issue =8 | pages =975–982 | doi= 10.1177/0333102409357642| pmid =20656709 }}</ref>
* [[SUNCT syndrome|Short-lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT)]] is a headache syndrome belonging to the group of TACs.<ref name=IHS/><ref name="Rizzoli2017">{{cite journal|last1=Rizzoli|first1=P|last2=Mullally|first2=WJ|title=Headache|journal=American Journal of Medicine|date=September 2017|volume=S0002-9343|issue=17|pages=30932–4|doi=10.1016/j.amjmed.2017.09.005|pmid=28939471|type=Review|doi-access=free}}</ref>
* [[Trigeminal neuralgia]] is a unilateral headache syndrome,<ref name=Flanders/> or "cluster-like" headache.<ref>{{cite journal |doi=10.1177/2049463712456355 |pmid=26516482 |pmc=4590147 |title=Trigeminal autonomic cephalgias |journal=British Journal of Pain |volume=6 |issue=3 |pages=106–23 |year=2012 |last1=Benoliel |first1=Rafael }}</ref>