5- Diarrhea
Having Diarrhea is usually normal, but if you have diarrhea for several weeks, it can be an early symptom of colon cancer which might require a colon cancer colonoscopy.
If a tumor obstructs the intestine, it can cause loose stools, or even persistent gas, stomach pain, nausea, vomiting, etc. A tumor can also cause a disruption to the lining of the digestive tract. If it persists for several days, it is a sign of dehydration that can signal a tumor, hence the importance of checking your health check.
