Hi Troy,

I get triggered by certain sounds too. Like auto crashes, crowd noises whether live or by the TV. I find my self very irritated. Even in the morning when I first get up the grind of the coffee grinder and banging of pots and pans with my kids talking, kinda makes me crazy first thing in the morning.

Hearing people fighting or hearing a parent yelling at a kid really bothers me. Make me sick to the stomach and I feel kinda numb and sad. I used to play the trumpet at home to cover up the sounds of my brother getting abused. Actually I had to stereo going, with the TV and playing the trumpet as loud as I could.
It is hard living with PTSD, but lucky some of those symptoms are getting some relief through EMDR therapy. But to answer your question, yes, sounds, sites and smells can all trigger memories due to PTSD.