This topic is about someone who has a colostomy and is experiencing some concerning symptoms: a burning stomach pain and dark-green stool. Normally, they take a laxative called senna, which usually results in bright-yellow output. However, for the past three weeks, they've noticed these changes without any recent changes in their diet or consumption of colored drinks. They are looking for advice or explanations for these symptoms.

Here are some helpful insights and advice:

1. It's important to seek medical evaluation promptly. Pain is often a warning sign, and a trusted gastrointestinal or stoma-experienced doctor can help determine if further investigation or treatment is necessary.

2. Dark-green stool can indicate that bile is moving through the intestines too quickly to change from green to yellow to brown. This can be triggered by several factors, including diarrhea, use of laxatives or antibiotics, medication side effects, food poisoning, celiac disease, ulcerative colitis, Crohn’s disease, malabsorption, IBS, bacterial overgrowth, infectious or traveler’s diarrhea (like salmonella or giardia), cancer, chlorophyll, iron supplements, and algae.

3. In the case of an ileostomy, blockages can cause dark-green watery output or even green bile vomiting. If the output is bile-colored but there is no pain, it might indicate that a blockage has resolved. However, if there is persistent pain along with green output, it could suggest a partial obstruction, which requires medical attention.

4. Long-term use of senna is generally not recommended unless it's necessary for opioid-induced constipation, as it can be harsh on the gastrointestinal tract. It might be beneficial to consider tapering off senna under medical supervision and instead increase natural dietary fiber intake from fruits and vegetables when possible.