What symptom may indicate a bowel obstruction?

Bowel obstruction is characterized by a blockage in the intestines that can prevent the normal passage of digestive contents. One of the hallmark symptoms of a bowel obstruction is abdominal distension, which occurs due to the accumulation of gas and fluid that cannot pass through the obstruction. This can lead to a visibly swollen abdomen and may also cause pain and discomfort.

Vomiting is also a common symptom in cases of bowel obstruction. As the contents of the intestine build up behind the blockage, the body attempts to expel the contents, leading to nausea and vomiting. The vomit may sometimes contain fecal material, especially in cases of more severe obstruction, as the material backs up beyond the blockage.

Other symptoms associated with bowel obstruction can include cramping abdominal pain, constipation, and the inability to pass gas, which further indicates the obstruction. When evaluating the symptoms presented in the other options, they either do not match the typical presentation of a bowel obstruction or are indicative of other conditions. Thus, abdominal distension and vomiting strongly align with the clinical picture of a bowel obstruction, making this answer the most appropriate choice.