I am a 42 year old male. Otherwise healthy, but approximately 10 days ago I suddenly started experiencing nosebleeds (no prior history). Over that period, I have had a total of 7. 3 have been what I would consider severe (constant bleeding, one lasting approximately 40 minutes, one approximately 45 minutes and one lasting approximately 1 hour and 20 minutes). One has been what I would consider moderate (approximately 20 minutes) and two were minor (5-10 minutes in duration). I have had no recent trauma, do not have high blood pressure, do not believe dry air is a likely factor (home HVAC systems have humidifier units to maintain humidity levels), do not use drugs (cocaine) and am not on any medications that would contribute to the nosebleeds. Any ideas on additional causes and or recommendations?