Cluster headache is a primary headache disorder (in and of itself) affecting 0.1% of the population (1 in a thousand), mostly men (3:1). Onset is rapid, usually within 5-15 minutes and lasts 45-90 minutes. Known as the "suicide headache", the pain is excruciating, usually one sided in or around the eye. Can the LENS help? Let's find out.
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