I travel for work training new restaurants on how to operate, do I need to file a state return for each state I work in?

I work in my home state most of the year, but occasionally I am sent out of state for 2-3 weeks to work in another state training all the new crew. Will I need to enter multiple state returns for each state I work in? I don't ever fill out new documents or any paperwork when I travel, they just switch my job code with payroll and I'm paid a different wage. I've just never worked out of state, so this is unfamiliar territory for me.