Estimates show that nearly 1 in a 1,000 people suffer from cluster headaches – a highly disabling chronic neurological condition characterized by intense stabbing pain in the area of one eye, often accompanied by swelling, tears and nasal congestion. The pain inflicted by the condition is recognized as among the most severe known to humans. Sufferers can have headache attacks multiple times per day, each lasting 15 to minutes to three hours. Read More
