Hi Jasmine, I think I may have already responded in part to this, but here goes again. I did experience discomfort around the J-tube site. Immediately following insertion, it was "stitched" into the surrounding skin. The stitch itched and was very sore. I also experienced bouts of constipation from the liquid nutrition. The radiation made my tube deteriorate and eventually I had difficulty getting anything to pass through the tube so the doctor had to remove it and insert a new one. When she put in the new one, they gave me a box of "patches" which hold the J-Tube in place. The patches itch and are uncomfortable. I cleaned the site regularly with Q-tip or cotton ball and hydrogen peroxide.
Remember, these things are all temporary. That is what will get you and your Dad through the treatments. Once the treatments and/or surgery (whatever he has) is over and they have the cancer arrested, he will feel better, they will take the feeding tube out, and he will be on the mend. Just don't get discouraged. God bless you!