I had a really really really really bad problem with nose bleeds all through out my childhood and adolescence. They normally always were in my right nostril as well. I haven't had a problem since I was a senior in high school, though.

These are some reasons why you may be having nosebleeds:
1. Dry nasal membranes
2. Previous trauma to the nose (which was my problem)
3. Medications you may be taking to prevent clotting (a lot of OTC pain medications contain aspirin which is an anti-inflammatory and may cause excess bleeding.. which is why you are told not to take any for a few days before having surgery)
4. A hereditary disease which may cause you to hemorrhage

This is what Estronaut has to say about the single nostril nosebleeders:
"If you have only one nostril going when you get a nose bleed, you may want to consider whether you're playing too harshly with your toys, so to speak; very often, single-nostril bleeds occur through mechanical trauma. In other words, you may be making those thin inner nose membranes unhappy through too much or harsh nose blowing or picking. Dry air is another possibility, since these membranes can dry out and be more prone to cracking. In this case, it may be beneficial to swab the membranes with a thick lubricant, such as petroleum jelly, in order to prevent any further bleeds."

Which that can't obviously bee the case all the time. My problem was I was hit on the right side of my nose when I was about 11 and I had a massive nose bleed and since then I couldn't go a week without getting one. Sometimes they'd happen once a day. Thought it was common for me to get a nose bleed occasionally when I was younger, too. But after that accident, it was ALL the time.
Source(s):
http://www.wisegeek.com/what-are-some-causes-of-nosebleeds.htm
http://www.womenshealth.org/a/nosebleed_cause.htm

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