to eight times per day for a period of weeks to months. In between clusters, there may be no headache symptoms, and this headache-free period can last months to years. The pain caused by cluster headaches is: one-sided severe often described as sharp or burning typically located in or around one eye The affected area may become red and swollen, the eyelid may droop, and the nasal passage on the affected side may become stuffy and runny. Thunderclap headaches These are sudden, severe headaches that are often described as the "worst headache of my life." They reach maximum intensity in less than one minute and last longer than 5 minutes. A thunderclap headache is often secondary to life-threatening conditions, such as intracerebral hemorhage, cerebral venous thrombosis, ruptured or unruptured aneurysms, reversible cerebral vasoconstriction syndrome (RVS), meningitis, and pituitary apoplexy. People who experience these sudden, severe headaches should seek medical evaluation immediately. Treatment The most common ways of treating headaches are rest and pain relief medication. Generic pain relief medication is available over the counter (OTC), or doctors can prescribe preventative medication, such as tricyclic antidepressants, serotonin receptor agonists, anti-epileptic drugs, and beta-blockers. It is important to follow the doctor's advice because overusing pain relief medication can lead to rebound headaches. The treatment of rebound headaches involves the reducing or stopping pain relief medication. In extreme cases, a short hospital stay may be needed to manage withdrawal

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