Cancer Diary: 🚫 No Shame in the Bathroom: What Poop Can Reveal About Cancer
Poop is one of the body’s earliest alarm systems, and different cancers can alter stool in different ways. Pencil‑thin stool is the classic red flag for colon cancer, but it’s far from the only pattern worth knowing about. The changes below come from how tumors block, bleed, or interfere with digestion and bile flow. 1. Colon & Rectal Cancer Why stool changes: Tumors narrow the passageway, bleed easily, or disrupt water absorption. Key stool patterns: Pencil‑thin or ribbon‑thin stool — narrowing from a tumor blocking the lumen. Pebble‑like hard pellets — obstruction causing excess water absorption. Blood in stool Bright red → lower colon or rectum. Black/tarry → bleeding higher up. Mucus in stool — especially with mucinous tumors. Alternating constipation and diarrhea — partial obstruction. 2. Pancreatic Cancer Why stool changes: Blocked bile duct → no bile reaching the intestine; lack of pancreatic enzymes → fat malabsorption. Key stool patterns: P...