https://www.facingourrisk.org/XRAY/red-flags-for-colorectal-cancer-in-young-adults
Researchers were able to identify the following four signs that occurred more often in the group of patients with colorectal cancer compared to the group without colorectal cancer:
- rectal bleeding (which may be seen in stool)
- pain in the abdomen (belly)
- diarrhea
- anemia (not having enough red blood cells to carry oxygen to tissues), which is found by a blood test
While these symptoms might be due to other underlying conditions, it is important not to ignore these symptoms if they continue. Among these four signs, rectal bleeding was most commonly associated with developing colorectal cancer.
Lynch Syndrome Ireland 