7) Gas and Bloating
Gas and bloating are the sister symptoms that often accompany other gut symptoms like diarrhea, constipation and abdominal pain. The majority of people experience these symptoms occasionally. However, if they become chronic and associated with other symptoms mentioned here, it may indicate a tumor growing in the colon.
A growing tumor tends to block the lumen of the colon. Depending on the stage (severity) of the disease, this blockage may prevent passing gas, and may lead to progressive bloating.