As you tie up your hair, untie, retie .. Especially if you have yours up all the time like I do, you're bound to tangle excess hair on the band. This is not only caused by a regular pony tail, but more specifically by a bun or messy bun style. It's simply loose hair that gets caught around the band as you tie and and retie your hair.
Now, if you have issues of your hair falling out in large clumps either way, then you should see a doctor. However, from what you're describing it is normal.
at 12:16 AM on Aug. 29, 2010