Are they a natural response? Does everyone have them? Do they mean anything special. I have been planning on a NB thru hike for the last year. Was supposed to start in Mar but a few things came up. Now, I am leaving the new job, and girl to do a flip flop from HF north then from HF south. I can not help but have doubts about my hike. Not so much about whether I want to go or not but what I will encounter. Is this normal? Will they dissipate once hiking?