Eyebrow Hair Loss On One Side?

I'm 18 and I've noticed that on one of my eyebrows I am losing a lot of hair. It's wierd cause it's only on one side. Should I see a doctor? Will it grow back? Please help!Eyebrow Hair Loss On One Side?
I use to have the same problem. Usually the problem stems from daily stress, example exams. Example, when i was stress, i use to pull out my eyebrows without knowing.