Nausea
Similar to abdominal pain, nausea is a common sign in gastrointestinal problems that might be quite difficult to differentiate. In colon cancer, as well as many other types of cancer, inflammation is a key factor for cancer growth and the spread of cancer cells throughout the body. Thus, cancer cells start manufacturing cytokines and inflammatory mediators that contribute to feeling nausea because they change the normal movement of the stools throughout the gastrointestinal tract.