After root canal treatment, tooth hurt, is it normal?!

After root canal treatment, tooth hurt, is it normal?

I have my root canal treatment 3 days ago but when my top tooth bites into the treated tooth the gum underneath the treated tooth hurt, is it normal?
I had pulpectomy before root canal treatment and after pulpectomy the gum didnt hurt but this time with root canal treatment it hurts when I bite onto it, why?

4 weeks ago
The specialist is out of town, I will have to go back in 10 days time....will the pain go away?

I also have had root canal treatment your tooth can be senatative for upto a few days afterwards thats normal as remember your dentist has just been poking at your roots in your tooth mine were sore for about 2 days nurofen plus helps the pain but if it presists go back to dentist