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This Concept Map, created with IHMC CmapTools, has information related to: cluster, Precipitating Factors include Chronic Smoking, Type of Migraine both are Vascular Headache, Location which is Unilateral, Cluster Headaches have Symptoms, Location radiating to Temple and Cheek, Increased Histamine Levels affect Blood Vessels, Unilateral which rarely Changes Sides, Precipitating Factors include Alcohol Use, weeks or months with 1-4 headaches per day in cluster period, Symptoms including Extreme Severity, Cluster Headaches both are Vascular Headache, Frequency of Occurence are Rare, Location beginning Around Eye, Frequency of Occurence is greater for Men, Short Duration typically 30-45 minutes, Cluster Headaches often occur during Spring and Fall, Cluster Headaches associated with Increased Histamine Levels, Cluster Headaches have Precipitating Factors, Frequency of Occurence begins to occur at Ages 20-45, Symptoms including Little or No Warning