Diarrhea burns primarily due to the presence of stomach acids, digestive enzymes, and bile that have not been fully neutralized or absorbed by the time the stool reaches the rectum. Because diarrhea speeds up digestion and the passage of waste, these acidic substances remain active and irritate the delicate tissues of the anus and rectum, causing a burning sensation. Additionally, other contributing factors include consumption of spicy foods that contain capsaicin (which directly irritates tissues), physical trauma or small tears in the anal and rectal tissue from rough or undigested food, excessive wiping, and irritation from chronic conditions or infections.

Key causes of burning diarrhea:

• Stomach acids, bile, and digestive enzymes not neutralized due to rapid transit of diarrhea, leading to tissue irritation and burning.
• Spicy foods containing capsaicin, which causes a burning sensation when excreted quickly.
• Physical trauma such as small tears or irritation from rough stool or wiping.
• Skin irritation and inflammation possibly from repeated diarrhea or associated conditions like hemorrhoids.
• Infections and certain medical conditions (e.g., irritable bowel syndrome, inflammatory bowel disease) can also cause burning through inflammation or tissue damage.

Managing burning diarrhea involves addressing the cause, avoiding irritants like spicy foods, gentle wiping, maintaining hydration, and seeking medical care if symptoms persist or worsen.