- Constipation: Partial blockages can slow things down.
- Diarrhea: Fluids can bypass a partial blockage, leading to loose stools.
- Alternating constipation and diarrhea: This pattern frequently signals something more serious.
- Blood in stool (hematochezia): Ranges from bright red to darker hues, depending on tumor location.
- Tenesmus: Worsens as the tumor and inflammation increase.
- Abdominal bloating and cramps: Gas build-up can’t pass easily if the bowel’s narrowed.
- Iron deficiency anemia symptoms: Nearly half of individuals with colon cancer develop anemia.
Scar tissue and strictures can develop as the tumor grows, sometimes leading to partial or full blockages. Even if you don’t always see bleeding in your stool, it can still be happening internally.
Poop Changes in Advanced Colon Cancer
Stage four colon cancer typically means the disease has spread to distant organs. Obstruction and bleeding often escalate, making signs more apparent. If the tumor is on the right side of the colon, your stool might become dark and sticky (melena), since blood mixes with oxygen and hemoglobin during its longer journey through the intestines.