Background: Sigmoid volvulus is among the common causes of intestinal obstruction worldwide. It usually occurs in elderly patients and rarely reported in children and young adults. Chronic form of sigmoid is a rare surgical condition in which patient can present with equivocal symptoms and signs of intestinal obstruction. Case presentation: Case 1: A 22 year old male university student presented with a long-standing history of abdominal discomfort and passage of loose stool. He occasionally experienced constipation and abdominal distension whenever he ate carbohydrate rich food. On admission at BMC, he had abdominal distension and hypertympanic percussion note on abdominal examination. Abdominal x-rays revealed features of sigmoid volvulus and patient was later prepared for elective laparotomy. Resection of a redundant sigmoid colon and primary anastomosis was done. Case 2: A 17 year old male referred from a peripheral district hospital with six months history of painless abdominal distention. During this period, he suffered from frequent attacks of early satiety and occasional constipation. On admission at BMC, his abdomen was distended with hypertympanic percussion note and exaggerated bowel sounds on abdominal examination. Abdominal x-ray and barium enema revealed features of sigmoid volvulus. Sigmoidectomy followed by primary colorectal anastomosis was done. Conclusion: Sigmoid volvulus should be considered as a differential diagnosis when attending young patients with a long-standing history of abdominal distension and constipation.