Although medical science cannot pinpoint the exact cause of headaches in a patient, some of the most common causes can typically be identified in the majority of cases. In order to properly diagnosis a headache, physician will usually categorize headaches in one of the following types. A primary headache is something almost all people are familiar with. Primary headaches are what the majority of headaches can be diagnosed as, and are almost never life threatening. Sinus headaches are associated with a deep and constant pain in the cheekbones, forehead or bridge of the nose. Cluster headaches are a far more serious form of headache, that although not life threatening, can bring about serious pain. When a cluster headache occurs, it can be accompanied by severe pain that focuses behind the eyes, also water running from the eyes and nose are common with cluster headaches.