An intestinal obstruction occurs when food or stool cannot move through the intestines. The obstruction can be complete or partial. There are many causes. The most common are adhesions, hernias, cancers, and certain medicines. 
Symptoms include
Severe abdominal pain or cramping 
Vomiting 
Bloating 
Loud bowel sounds 
Swelling of the abdomen 
Inability to pass gas 
Constipation
A complete intestinal obstruction is a medical emergency.  It often requires surgery.
  NIH: National Institute of Diabetes and Digestive and Kidney Diseases