Editing Cluster headache (section)

===Oxygen===
[[Oxygen therapy]] may help to abort attacks, though it does not prevent future episodes.<ref name=AFP2013 /> Typically it is given via a [[non-rebreather mask]] at 12–15 liters per minute for 15–20 minutes.<ref name=AFP2013 /> One review found about 70% of patients improve within 15 minutes.<ref name=EM2009 /> The evidence for effectiveness of 100% oxygen, however, is weak.<ref name="EM2009"/><ref name=pmid26709672>{{cite book |doi=10.1002/14651858.CD005219.pub3 |pmid=26709672 |chapter=Normobaric and hyperbaric oxygen therapy for the treatment and prevention of migraine and cluster headache |title=Cochrane Database of Systematic Reviews |issue=12 |pages=CD005219 |year=2015 |last1=Bennett |first1=Michael H |last2=French |first2=Christopher |last3=Schnabel |first3=Alexander |last4=Wasiak |first4=Jason |last5=Kranke |first5=Peter |last6=Weibel |first6=Stephanie |volume=2016 |pmc=8720466 }}</ref> Hyperbaric oxygen at pressures of ~2 times greater than atmospheric pressure may relieve cluster headaches.<ref name=pmid26709672/>