Losing Hair

My 7-year old female grey has beautiful fur. So pretty, so soft. But lately something has changed. She is missing hair on her lower back, hind legs, rump and base of the tail. She is not bald, but in people terms she looks like a 4 year kid whose 6 year old sibling grabbed some scissors to play beauty parlor. It looks chopped off/peach-fuzzy and is coarse. Tried to upload a photo but did not work, hence the description.

Is this something natural (shedding/self biting) or a sign of something more insidious.