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</html><thumbnail_url>https://real-sciences.com/wp-content/uploads/2026/06/Cluster-Headache.jpg</thumbnail_url><thumbnail_width>854</thumbnail_width><thumbnail_height>596</thumbnail_height><description>Cluster headache is one of the most painful conditions in medicine. While it shares the word &#x201C;headache&#x201D; with common head pain, it differs from it in many fundamental ways. Cluster headaches occur on only one side of the head, specifically around or behind the eye, and the pain is often described as stabbing, boring, burning, [&hellip;]</description></oembed>
