While I was under my rad/onc doc, he always had me get a chest x-ray yearly to rule out lung cancer since the sarcoma usually travels to the lungs first. My x-ray showed a mass in my right colon so I had to get scoped. I had no symptoms and no pain and there was no history of colon cancer in my family either, but I've fought tumors and cysts for 50 years.
They found a precancerous tumor in my right large colon and I had to have surgery. I had to have a right hemicolectomy. The surgeon also removed adhesions from ALL my intestines and found it strange that I never had any pain for either the tumor of the adhesions.
I had another colonoscopy the following year but was very upset about doing the drink because I got sick from it the first time. Turns out they had other cleansers so I went through with it. I now only have to see the doc in 5 years now. I was considered "clean" but I'm sure my adhesions are coming back because I do have pain a lot of time now, and my incision site is right at keyboard level and waist level (clothing) which makes me so sore at the site and sometimes it even feels like I have something "sticking" me at that site. I swear whatever he used to attach my small intestine to the rest of my colon never dissolved, but I refuse to go back to him. He was ignorant.
I hope your boyfriend's wound soon heals. Stay strong and don't give up the fight. It can be beat.