Is Hair Always the Same Thickness All Over the Scalp?

I recently pulled out a few hairs at the front hairline and noticed some were thinner than others.I did the same at the back of my head where the hair meets the neck and found the same thing. Are there different thickness hairs all over your head or is this miniturization? I dont understand as i thought the hair that meets the neck could not be lost?? Is it normal to have some thinner hairs all the way round the head where the hairline starts??
Thanks for a great site, your help is much appreciated!

Generally, if there is no miniaturization (no balding) present, most hair on your scalp will have the same thickness except for:

1. the very front of the hairline
2. the nape of the neck
3. the temple prominences on the front-side of the scalp