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Volvulus is a condition, where the intestine twists upon itself. Such condition can be seen in both the small intestines (more common) as well as the large intestines (cecum or sigmoid colon).
The cause for such twisting is due to reduced intestinal motility, weak intestinal support structures and/ or elongation of the intestines.
Stress is not a direct cause of Volvulus. Stress is a major factor that can be the cause of conditions like Irritable bowel syndrome, but IBS is not a cause of volvulus.