Clinical features

Abdominal pain which is colicky or cramping in nature

Projectile vomiting. It occurring early in proximal obstruction and late in distal obstruction. The vomitus may be bilious in proximal(small) intestinal obstruction and feculent in distal (large) intestine obstruction.

Abdominal distension

Absolute constipation. It occurs early in distal obstruction and late in proximal obstruction. It is associated with flatus in partial intestinal obstruction.