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www.webmd.com/migraines-headaches/guide/migraines-headaches-basics

May 18, 2016 ... They cause mild to moderate pain and come and go over time and usually ... The pain can be so bad that most people with cluster headaches ...

www.emedicinehealth.com/worst_headache_of_your_life/article_em.htm

Mar 27, 2017 ... Read about the worst headache in your life. This type of headache may be a symptom of a life-threatening problem such as: meningitis, tumors, ...

www.mayoclinic.org/symptoms/headache/basics/causes/sym-20050800

May 4, 2016 ... Headache: Symptom — Overview covers definition, possible causes of this ... that involves sudden, severe headaches with multiple causes).

www.medicinenet.com/headache/article.htm

Secondary headaches are usually a symptom of an injury or an underlying illness. ... Many patients equate severe headache with migraine, but the amount of ...

www.medicalnewstoday.com/articles/73936.php

Find out about the causes, types, and treatments available for headache. ... These are sudden, severe headaches that are often described as the "worst ...

www.everydayhealth.com/headache-migraine/headache-could-signal-something-serious.aspx

Jun 16, 2014 ... Your headache causes could be more than just a normal headache. ... one sign of stroke is a sudden severe headache with no obvious cause.

www.everydayhealth.com/news/strange-reasons-you-have-headache

Jan 8, 2015 ... Hors d'oeuvres, dehydration, caffeine withdrawal — these and other strange headache triggers.

medlineplus.gov/ency/patientinstructions/000424.htm

Jan 5, 2016 ... Other causes of headaches that should be checked by a health care ... This is the first severe headache you have ever had in your life and it ...

www.tylenol.com/symptoms/headaches/causes

Read about the 10 most common headache triggers that we can encounter each day.