They missed abnormalities
I had all my screening here. I was plagued with constipation and my stool sample came back fine. It got worse and a repeated test also came back fine. Things got worse and I went to A&E where they said I had acid and gave me medication. It helped a bit but then I got really sick and was in so much pain, throwing up so I went back to A&E. They did a scan and put me on a drip and almost discharged me but then someone said the scan showed something abnormal. They said it was cancer and I had surgery the next morning. They then confirmed it was stage three. They missed the first scans abnormalities too.