A muscle imbalance in the shoulders from years of mouse use will almost certainly cause some form of neck pain, as will anterior pelvic tilt from an undeveloped posterior from years of sitting in a chair. Typing related injuries in the elbow occur because the tendons - and the muscles surrounding the tendons - are too weak to support something as simple as typing. So long as you're smart and your hands aren't stretching across the keyboard you're not going to develop something sinister-to-treat like the emacs pinky.

Take care of yourself. There's certainly more of us on here: https://news.ycombinator.com/item?id=17132938