Ponytail & Hair Loss
A: If you have been pulling the hair very tight into the ponytail and the weight of the hair is exerting constant pressure on the hair at the parting, then you could be causing breakage and pulling of the hair out at the root level. However, the odds are that this is would result in noticeable discomfort along with the loss of the hair.
You might also consider using lightweight "scrunchy" ponytail gatherers and barrettes to confine the hair so that the accessory doesn't add any weight to the hair, and therefore, add any stress.
Depending on the location of the parting, you might consider that you are experiencing some form of alopecia. Remember that even women can develop androgenic alopecia (male pattern baldness) and in any event, abnormal hair loss is called alopecia any way.
If you notice continuing loss of hair, talk to your doctor. There may be dietary, medical or hormonal issues at work that can be causing this problem.
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See also:
Hair loss
Alopecia
How to make a poof ponytail
Ponytails and recession of the hairline